Reviews

Ludwig, R., Nguyen, T.K.D., et al. “Design of macrocyclic ligands of calixarene type for chemical analysis and separation of heavy metals”, CSV, (in the press) (2005)

Ludwig, R., Nguyen, T.K.D. ‘Calixarene-based molecules for cation recognition’, Sensors 2  397 - 416 (2002)

Ludwig, R. "Calixarenes in analytical and separation chemistry", Fresenius' J. Analyt. Chem. 367(2) 103-128 (2000).

Ludwig, R. "Turning ionophores into chromo- and fluoroionophores" in "Calix 2001" ed. by Z. Asfari, V. Böhmer, J. Harrowfield, J. Vicens, Kluwer Academic Publ., ISBN 0-7923-6960-2 (2001).

Ludwig, R. "Review on calixarene-type macrocycles and metal extraction data." JAERI, JAERI-Review 95-022 (55 p.) (1995).
 

Articles

Ludwig, R., Nguyen, T.K.D., Higuchi, H., and Henniger, J. “Modelling the transport of low-molecular weight metal complexes across the liquid-liquid interface during extraction in a synthetic boundary cell by using the finite differences method”  in: Progr. Colloid and Polymer Sci. Vol. 127: Analyt. Ultracentrifugation VII, ed. M.D. Lechner, L. Börger, ISBN 3-540-20203-X p. 89-97(2004).

Gupta, V.K., Ludwig, R., Agarwal, S. “Strontium(II) sensor based on modified calix[6]arene in PVC matrix” Analyt. Sciences (in the press, 2005).

Gupta, V.K., Ludwig, R., Agarwal, S. “Anion recognition through modified calixarenes; a highly selective sensor for HPO42- Analyt. Chim. Acta (in the press, 2005).

Bhosale, S., Li, G., Li, F., Wang, T., Ludwig, R., Emmler, T., Buntkowsky, G., Fuhrhop, J.-H, “Cellobiose, tyrosine and related edge amphiphiles in porphyrin-based nanowells”, (submitted).

Belhamel, K., Ludwig, R., Benamor, M. “Nickel ion-selective membrane electrodebased on new t-octylcalix[6]arene derivative”, Microchim. Acta  149(1) 145-150 (2005).

Ludwig, R., Belhamel, K., Nguyen, T. K. D., and Benamor, M. “Design of calixarene-type ligands for second sphere complexation of noble metal ions”, Eur. J. Inorg. Chem.(22) 4110-4116 (2003).

Belhamel, K., Nguyen, T. K. D., Benamor, M., and Ludwig R.“Extraction of Gold from Hydrochloric Acid by Calixarenes”  in Proceedings of ISEC 2002, ed. K. C. Sole, P. M. Cole, J. S. Preston and D. J. Robinson, C. v. Rensburg Publ. Ltd., Melville, ISBN 1-919783-24-5, Vol.1, p.307-312  (2002).

Luwig, R., and Lentz, D., "Crystal structure of erythro-2-hydroxy-3-phenylbutyric acid",
Z. Krist. New. Cryst. Struct. Vol. 217, 59-60 (2002).

Ludwig, R., “Alpha-halogenierte Calix[6]arene, Verfahren zu ihrer Herstellung und ihre Anwendung“ EP 02 020 853.4 (Priority DE/24.09.01/ 10 146 928.4) (18. 9. 2001)

Ludwig,R., Nguyen, T.K.D., and Nabeshima, M. "Determination of Mass Transfer Coefficients of 99Tc(VII) in Forward and Backward Transport in PUREX-Relevant Systems by Using Analytical Ultracentrifugation",
Radiochim. Acta Vol. 89, 169-177 (2001).

Ludwig, R., Nguyen, T.K.D. "Heavy metal extraction and absorption by calixarenes - a brief overview"
in: Behandlung von Abwässern mit schwermetallhaltigen Verbindungen (Bd. 14 Biolog. Abwasserreinigung), ed. A. Kornmüller, TU Berlin/Sonerdorschungsbereich-193,ISBN 3-7983-1828, 49-65 (2000).

Ludwig,R., Miratsu, M., Nguyen T.K.D., Marx, G., and Nabeshima M. "Apparent diffusion coefficients of U(VI), Re(VII) and Tc(VII) in 3 M nitric acid and 30% TBP diluted in n-dodecane",
Solvent Extraction Research and Development, Japan Vol. 7, 85-92 (2000).

Ludwig, R., Lentz, D., and Nguyen, T.K.T. "Lanthanide and actinide extraction by calixarenes with different ring sizes and high molecular flexibility",
Radiochim. Acta Vol.88 (6) 335-343 (2000).

Nguyen, T.K.D., Kunogi, K., and Ludwig, R. "Lanthanide and actinide extraction with calix[4]- and calix[6]arenes bearing amide groups."
in: Solvent Extraction for the 21st century (Proceedings of ISEC'99), edited by M. Cox, M. Hidalgo and M. Valiente, The Society of Chem. Ind., London, ISBN 0-901001-83X, Vol. 1, p. 249-254 (2001).

Nguyen, T.K.D. and Ludwig, R. "Solvent extraction of heavy metals with macrocyclic ligands based on calix[4]arenes."
New Journal of Chemistry Vol. 23 (6) 603-607 (1999).

Nguyen, T.K.D., Kunogi, K., and Ludwig, R. "Design of macrocyclic ligands for the selective extraction of f-group elements."
Bull. Chem. Soc. Japan Vol. 72 (5) 1005-1011 (1999).

Ludwig, R., Nguyen, T.K.D., Kunogi, K., and Tachimori, S. "Macrocyclic extractants for separating Am(III)/Ln(III)."
Technical Report JAERI-Conf. 99-04, 477-485 (Proceedings of the 2nd NUCEF Int. Symposium 1998) (1999).

Ludwig, R., Tachimori, S., and Yamato, T. "New macrocyclic extractants for the processing of inorganic waste."
Nukleonika Vol. 43 (2), 161-174 (1998).

Ludwig, R., Kunogi, K., Nguyen, T.K.D., and Tachimori, S. "A calixare-based extractant with se-lectivity for Am(III) over Ln(III)."
J. Chem. Soc., Chemical Communications, 1985-1986 (1997).

Ludwig, R. and Tachimori, S. "Solvent extraction of noble metals by calix[4]arenes bearing mixed functionalities."
Solvent Extraction Research and Development, Japan Vol. 3, 244-254 (1996).

Ludwig, R. and Gauglitz, R. "Calixarene type extractants for metal ions with improved properties."
in "Value adding through solvent extraction" (Vol.1), edited by D.C. Shallcross, R. Paimin, and L.M. Prvcic, The University of Melbourne, ISBN 0-7325-1250-6, Vol. 1, p. 365-369, (1996).

James, T.D., Kawabata, H., Ludwig, R., Murata, K., and Shinkai, S. "Cholesterol as a versatile platform for chiral recognition."
Tetrahedron Vol. 51 (2), 555-566 (1995).

Ludwig, R., Matsumoto, H., Takeshita, M., Ueda, K., and Shinkai, S. "Study on monolayers of metal complexes of calixarenes and their luminescence properties."
Supramolecular Chemistry Vol. 4, 319-327 (1995).

Ludwig, R., Shiomi, Y., and Shinkai, S. "Saccharide recognition by amphiphilic diboronic acids at the air-water interface and the relationship between selectivity and stoichiometry."
Langmuir Vol. 10(9), 3195-3200 (1994).

Ludwig, R., Harada, T., Ueda, K., James, T.D., and Shinkai, S. "Chiral discrimination of saccharides by monolayers of a steroidal boronic acid."
J. Chem. Soc., Perkin Trans. 2 697-702 (1994).

Ludwig, R., Ariga, K., and Shinkai, S. "Sensitive detection of saccharides by an amphiphilic phenylboronic acid at the air-water interface in the presence of quaternized amines."
Chem. Letters, 1413-1416 (1993).

Ludwig, R., Inoue, K., and Yamato, T. "Solvent extraction behaviour of calixarene-type cyclophanes towards trivalent La, Nd, Eu, Er, and Yb."
Solvent Extr. Ion Exchange Vol. 11 (2), 311-330 (1993).

Ludwig, R., Inoue, K., Shinkai, S., and Gloe, K. "Solvent extraction behaviour of p-tert-butylcalix[n]arene carboxylic acid derivatives towards trivalent lanthanides and sodium."
in "Solvent extraction in the process industries" (Vol. 1), edited by D.H. Logsdail and M.J. Slater, Elsevier Applied Science, ISBN 1-85861-042-7, p. 273-278, (1993).

Ludwig, R. and Inoue, K. "About matrix effects at ICP-measurements of lanthanoids."
Reports of the Faculty of Science and Engineering, Saga University, Japan Vol. 20 (2), 7-12 (1992).

Ludwig, R. and Dreyer, R. "Application of the electromigration technique for measuring ligand exchange equilibria in non-aqueous solutions."
Analytical Sciences Vol. 7, 1659-1662 (1991).

Ludwig, R., Fischer, S., Dreyer, R., Jacobi, R., and Beger, J. "Complex formation equilibria be-tween astatine(I) and sulfur-containing chelating ligands." Polyhedron Vol. 10 (1), 11-17 (1991).

Ludwig, R. und Fischer, S. "Zur Komplexbildung von At(I) mit Halogenidionen in alkoholischen Lösungen."
Isotopenpraxis Vol. 26 (1), 27-29 (1990).

Rösch, F., Hung, T.K., Dittrich, S., Ludwig, R., Buklanov, G.V., Dreyer, R., and Chalkin, V.A. "Electromigration studies of carrier-free 239Np(V) in aqueous solutions." Isotopenpraxis Vol. 26 (8), 355-363 (1990).

Ludwig, R., R. Dreyer, and S. Fischer. "First investigations of complex formation of At(I) with phosphorous organic compounds."
Radiochimica Acta Vol. 47, 129-130 (1989).

Ludwig, R., Fischer, S., Hussein, H., Frind, M., and Dreyer, R. "Stability constants of At(I) - complexes with thiourea, iodide and mixed ligands in ethanol and water." J. Radioanal. Nucl. Chem., Articles Vol. 134 (1), 141-149 (1989).

Dreyer, R., Fischer, S., Ludwig, R., und Doberenz, W. "Anwendung der Elektromigration in freier Elektrolytlösung zur Charakterisierung der Radio-Halogenidionen in nichtwässrigen Lösungen." Isotopenpraxis Vol. 24 (10), 389-392 (1988).

Ludwig, R. et al. "Electromigration of carrier-free radionuclides. 5. Ion mobilities and hydrolysis of Np(V) in aqueous perchlorate solutions." Radiochimica Acta Vol. 42, 43-46 (1987).

Rosch, F., Milanov, M., Hung, T.K., Ludwig, R., Buklanov, G.V., and Chalkin, V.A. "Electromigration of carrier-free radionuclides. Ion mobilities and hydrolysis of Np(V) in aqueous perchlorate solutions." Joint Institute for Nuclear Research Dubna, Report P6-86-829 (1986).

Rezension

über 'Extraction of Metals from Soils and Waters' (Series 'Modern Inorganic Chemistry') by Max Roundhill, published by Kluwer Acad. Publ., reviewed in Angew. Chemie (2002)

Conference

Nguyen, T.K.D., Ludwig, R. “Transport phenomena during the extraction of metal oxoanions by Aliquat 336 as studied by analytical ultracentrifugation and the modelling with FDM”, Int. Solv. Extr. Conf., Beijing, China 19-23.9. 2005 (lecture).

Ludwig, R., Nabeshima, M. “Ion recognition by calixarenes - Relationships between structure and selectivity” Chemiedozententagung München 7.-9. 3. 2005 (lecture).

Ludwig, R., Nguyen, T.K.D. “Solvent extraction of Tc(VII) by calixarenes bearing pyridino groups” Int. Sympos. on technetium - Science and utilization (IST 2005) Oarai, Japan 24.-27.5. 2005 (invited).

Ludwig, R., Nguyen, T.K.D. “Macrocyclic ligands designed for environmental analytical chemistry and environmental remediation” Humboldt-Conf. on Environmental Process Eng. and its related sciences, Minden, Malaysia 25.-28.2. 2005 (invited lecture).

Ludwig, R., Nguyen, T.K.D., Jira, T., Menyes, U., Roth, U.”Development of HPLC-materials for analysis and separation of plant extracts based on molecular recognition with calixarenes” Abstr. p. 70, DECHEMA Workshop Phytoextracs - Products and Prosesses, Frankfurt a.M. 8.-9. 11. 2004

Ludwig, R., Nguyen, T. K. D., Herrmann, E. “ Coordination chemistry of trivalent f-elements in solution with calixarene-type ligands” NRC-6, Aachen 29.8. - 3. 9. 2004 (lecture); in: Advances in Nucl. and Radiochemistry (ed. S.M. Qaim, H.H. Coenen), ISBN 3-89336-362-9, FZJ (2004) p. 46-47.

Ludwig, R., Nguyen, T.K.D., Ohto, K., Inoue, K."Influence of chain length in chelating macrocyc-les on the extraction of Am(III)"  GDCh Jahrestagung, München 7.-10.10., Abstr. NUK-ACT-041, 2003.

Ludwig, R. “Design and Application of Macrocyclic Ligands of Calixarene Type for Chemical Analysis and Separations”, 8th Eurasia Conf.  Chem. Sciences, Vietnam, 20.-24.10. 2003 p.286 (inv. lecture)

Ludwig, R.  “Calixarenes for chemical separations”   Ausstellungs-Tagung für Chemisches Apparatewesen (ACHEMA) in Frankfurt a.M., 19. - 24. Mai, 2003 (Standleitung - booth manager).

Ludwig,R., Takeshita, K., Gupta, V.K., Nguyen , T.K.D. “Komplexierung und Extraktion von Kationen und Anionen mit Calixarenen”, Chemiedozententagung, Chemnitz 16.-19.3. 2003, C29.

Henniger, J., Nguyen T.K.D., Ludwig, R. “Anwendung der Methode der finiten Differenzen zur Beschreibung des eindimensionalen Stofftransportes bei Diffusion und Extraktion”, Fachausschußsitzung Extraktion, Würzburg 5.-7.3. 2003, S. 18.

Ludwig, R., Nguyen, T.K.D., Henniger, J. “Modelling the transport of low-molecular weight metal complexes across the liquid-liquid interface during extraction in a synthetic boundary cell by using the finite differences method”, 13. Int. Sympos. Analyt. Ultracentrifugation, Osnabrück 6.-7.3. 2003.

Nguyen, T.K.D., Higuchi, H., and Ludwig, R. "Measuring and modeling the transport of anions across an unstirred interface under the influence of chemical reactions"
DECHEMA/GVC Fachausschussitzung Extraktion, Bingen 10.-12.4., P. 3.08, VDI 2002.

Ludwig,R., Nguyen T. K. D., and K. Belhamel, K."Noble metal extraction by calixarenes",
Int. Solv. Extr. Conf. (ISEC'02) 17-21.3., Cape Town, South Africa, 2002.

Ludwig, R. "Chemische Analytik mit Calixarenen", 3. Caltrex-Tag, Berlin 21.2. 2002.

Ludwig,R., Kuwata, S., Nguyen, T.K.D. "Extraktion dreiwertiger f-Elemente mit Calixarenen: Untersuchungen zur Beziehung zwischen Ligandstruktur und Selektivitätskoeffizient unter besonderer Berücksichtigung von relativistischen Effekten",
GDCh Jahrestagung, Fachgruppentagung Nuklearchemie, V-17, Würzburg 2001.

Nguyen, T.K.D., Nabeshima, M., and Ludwig, R. "Optimizing the Safety of Spent Fuel Separation: Apparent Diffusion and Phase Transfer Coefficients of Tc(VII) and Other Fission Products and Investigations on Coupled Transport in the System HNO3/U(VI)//TBP/Dodecane"
GDCh Jahrestagung, Fachgruppentagung Nuklearchemie (Meeting of the Nuclear Chemistry Div. of the German Chemical Society), p. 88, Würzburg 2001.

Ludwig, R., Nguyen, T.K.D. "Schwermetallextraktion und -absorption mit Calixarenen - Ein Überblick."
10. Kolloquium 'Behandlung von Abwässern mit schwermetallhaltigen Verbindungen, TU Berlin, 20.-21. Nov. 2000.

Ludwig, R., Nguyen, T.K.D., Nabeshima, M. "Extraktionskinetische Untersuchungen im System Tc(VII)/U(VI)/HNO3/TBP/Dodecan mittels AUZ." DECHEMA/GVC-Fachausschußsitzung "Extraktion", Bremen, 7.-8. Sept. V-6, 2000.

Kuwata, S., Nguyen, T.K.D, Ludwig, R., and Inoue, K. "Solvent Extraction of mono- and trivalent metal ions by calixarene-based cation exchangers with high molecular flexibility." 26th Int. Conf. on Solution Chem., Fukuoka, July 26-31, p.252, 1999.

Ludwig, R. und Nguyen, T.K.D. "Schwermetallextraktion mit funktionalisierten Calixarenen."
Chemiedozententagung 1999, Oldenburg, C-33, 1999.

Nguyen, T.K.D., Kunogi, K., and Ludwig, R. "Lanthanide and actinide extraction with calix[4]- and calix[6]arenes bearing amide groups."
Int. Solvent Extraction Conference (ISEC'99) in Barcelona, July 11.-16., ED-028 (p. 71), 1999.

Ludwig, R., Nguyen, T.K.D., Kunogi, K., and Tachimori, S. "Macrocyclic extractants for separating Am(III)/Ln(III)."
2nd NUCEF Int. Symposium in Hitachinaka, Ibaraki, Japan, Nov. 16. - 17., PB-5, JAERI 1998.

Nguyen, T.K.D. and Ludwig, R. "Extraction of several toxic heavy metals with new macrocyclic compounds."
2nd Euroconference on Environmental Analytical Chemistry in Cordoba, Spain, 31.10. - 6.11., University of Cordoba, V and P. 3, 1998.

Hasegawa, Y., Harada, Y., and Ludwig, R. "Application of alpha-hydroxycarboxylic acids as masking and synergistic agents in mutual separation of lanthanoids(III)." Int. Symp. Trace Analysis at Tokyo University (Japan), 31.7. - 1.8., 1998.

Ludwig, R. und Nguyen, T.K.D. "Vergleich selektiver Extraktionsmittel auf der Basis von Calixarenen mit kommerziell verfügbaren Extraktionsmitteln."
7. Sitzung des DVCV (DECHEMA)-Gemeinschaftsausschusses "Extraktion" in Kaiserslautern, 17. - 18. Sept., Vortrag Nr. 9, 1998.

Ludwig, R., Nguyen, T.K.D., und Kunogi, K. "Fortschritte bei der extraktiven Trennung von Lanthaniden und Actiniden mit Calixarenen."
Vortragstagung der GDCh-Fachgruppe Nuklearchemie in Dresden, 7.-9. Sept., P. 2.6, 1998.

Ludwig, R. "Selektive Flüssig-Flüssig-Extraktion von Schwermetallen mit Käfigverbindungen."
Arbeitssitzung des GVC/DECHEMA-Gemeinschaftsausschusses "Produktionsintegrierte Wasser- Abwassertechnik" in Bremen, 31. Aug., VDI, Gesellschaft Verfahrenstechnik u. Chemie-ingenieurwesen, Vortrag Nr. 5, 1998.

Ludwig, R., Kunogi, K. and Nguyen, T.K.D. "Comparison of the extraction of Ln(III) and Am(III) by calix[6]arenes."
XXIII Int. Symposium on Macrocyclic Chemistry in Turtle Bay, Hawaii, June 7.-12., edited by J. Sessler, E. Anslyn and E. Kimura, PSA 70, 1998.

Nguyen, T.K.D., Kunogi, K. and Ludwig, R. "Influence of the structure of calix[6]arenes on the extraction of Ln(III)."
XXIII Int. Symposium on Macrocyclic Chemistry in Turtle Bay, Hawaii, June 7.-12., edited by J. Sessler, E. Anslyn and E. Kimura, PSA 30, 1998.

Ludwig, R., Nguyen, T.K.D. and Kunogi, K. "Solvent extraction of trivalent lanthanides and actinides by calix[6]arenes bearing carboxylic acid groups." 4th International Conference on Calixarenes in Parma, Italy, 31.8.- 4.9., P 63, 1997.

Ludwig, R. und Gauglitz, R. Stand: "Extraktionsmittel der Neuen Generation - Massgeschneidert für Analytik, Hydrometallurgie und Schadstoffabtrennung." Ausstellungs-Tagung für Chemisches Apparatewesen (ACHEMA) in Frankfurt a.M., 9. - 14. Juni, 1997.

Ludwig, R. "New macrocyclic extractants for the processing of inorganic waste."
Int. Conference on Radioisotope and Radiation Application in Industry and Environment at IUT, Berlin, Oct. 20. - 23., p. 89, 1996.

Ludwig, R. and Gauglitz, R. "Calixarene type extractants for metal ions with improved properties."
Int. Solvent Extr. Conf. (ISEC '96) in Melbourne (Austr.), March 19. - 23., P. 2-15, 1996.

Ludwig, R. and Tachimori, S. "Metal extraction with calixarene-type extractants bearing amide and carboxylic acid groups."
Symposium on Solvent Extraction at Kyushu University, Fukuoka, Nov. 27. - 29., Japanese Association of Solvent Extraction, p. 41-42, 1995.

Ludwig, R. "Neue Extraktionsmittel vom Typ der Cyclophane zur Metallionentrennung für die Endlagerung radioaktiven Abfalls."
Vortragstagung der GDCh-Fachgruppe Nuklearchemie in Berlin, 5. - 9. Sept., GDCh 1994.

Ludwig, R., Harada, T., Ueda, K., James, T.D., and Shinkai, S. "Chiral discrimination of saccharides by monolayers of a steroidal boronic acid."
Annual Meeting of the Chemical Society of Japan, March 1994 in Tokyo, 1994.

Ludwig, R., Inoue, K., Shinkai, S., and Gloe, K. "Solvent extraction behaviour of p-tert-butylcalix[n]arene carboxylic acid derivatives towards trivalent lanthanides and sodium." Int. Solvent Extr. Conf. (ISEC '93), Sept. 9. - 15. in York (UK), (Proc. p. 273-278), 1993.

Ludwig, R. and Shinkai, S. "Study on the compressibility of monolayers prepared from acid derivatives of calixarenes as a function of the pH." Second Workshop on Calixarenes and Related Compounds in Kurume, Fukuoka (Japan), June 2. - 4., PS/B-24, 1993.

Ludwig, R., Shiomi, Y., and Shinkai, S. "Sugar recognition by monolayers of boronic acids."
Annual Meeting of The Chemical Society of Japan,
March 28. - 31. in Tokyo, p. 513, 1993.

Ludwig, R. and Inoue, K. "About solvent extraction of rare earth metal ions with carboxymethoxy-p-tert-butylcalix[6]arene."
Symposium on Rare Metals, Dec. 12. - 13. in Sendai (Japan), p. 58-59 (in Japanese), 1991.

Ludwig, R., Inoue, K., and Shinkai, S. "Solvent extraction of lanthanide ions using a calix[6]arene compound."
Symposium on Solvent Extraction,
Dec. 4. - 6. in Toyonaka, Osaka, Proceedings p. 53-60, 1991.

Ludwig, R. and Dreyer, R. "Application of the electromigration technique for measuring ligand exchange equilibria in non-aqueous solutions."
IUPAC-Congress: Int. Conf. on Analytical Science ICAS '91, Aug. 25. - 31. at Makuhari Messe, Chiba (Japan), p.668, 1991.

Ludwig, R. "Application of the electromigration method for measuring ligand exchange equilibria."
ICAS Kyushu Post Conference, Sept. 1. - 2. in Fukuoka (Japan), p. 36, 1991.

Dreyer, R., Fischer, S., Ludwig, R., und Doberenz, W. "Anwendung der Elektromigration in freier Elektrolytlösung zur Charakterisierung der Radio-Halogenidionen in nichtwässrigen Lösungen."
Workshop zu ausgewählten Aspekten der Radiochemie in Dresden, 26. - 27. Nov., ZFI Mitteilungen (Leipzig), S. 77-78, 1990.

Fischer, S., Ludwig, R., und Dreyer, R. "Zur Komplexbildung des At(I)-Kations gegenüber von Liganden mit den Donoratomen der V., VI. und VII. Hauptgruppe des PSE."
Workshop zu ausgewählten Aspekten der Radiochemie in Dresden , 26. - 27. Nov., ZFI-Mitteilungen (Leipzig), S. 81-89, 1990.

Ludwig, R. und Fischer, S. "Zur At(I)-Komplexbildung mit Triphenylphosphin und Triphenylphosphinselenid."
Workshop zu ausgewählten Aspekten der Radiochemie in Dresden, 26. - 27. Nov., ZFI-Mitteilungen (Leipzig), S. 92-93, 1990.

Ludwig, R., Fischer, S., Dreyer, R., Jacobi, R. and Beger, J. "Complex formation equilibria between astatine(I) and sulfur-containing chelating ligands." Workshop zu ausgewählten Aspekten der Radiochemie in Dresden, 26. - 27. Nov., ZFI-Mitteilungen (Leipzig), S. 94-95, 1990.

Rösch, F., Ludwig, R., Reimann, T., Buklanov, G.V., Milanov, M., Dreyer, R., and Chalkin, V.A.
International Conference on Actinides 1989 in Taschkent (Kasachstan), Sept. 24. - 29., p. 274, 1989.

Ludwig, R., Fischer, S., Dreyer, R., Weber, M., and Hartmann, H. "Complex Compounds of 211At in Aqueous and Non-Aqueous Solutions."
11th Radiochemical Conference in Marianske Lazne, Apr. 21. - 25., 1987.

Dreyer, R., Doberenz, W., Fischer, S., und Ludwig, R. "Die Elektromigration in freier Elektrolytlösung zur Charakterisierung trägerfreier Radioionen." 4th Meeting on Nuclear Analytical Methods in Dresden, 4. - 8. Mai, ed. von S. Niese, S.497, 1987.