Levy G, Lutz I, Krüger A, Kloas W (2004): Bisphenol A induces feminization in Xenopus laevis tadpoles, Environ. Res. 94, 102-111

Levy G, Lutz I, Krüger A, von Tümpling W, Kloas W (2004): Retinol-binding protein as a biomarker to assess endocrine-disrupting compounds in the environment, Anal. Bioanal. Chem. 378, 676-683

Bögi C, Levy G, Lutz I, Kloas W (2002): Functional genomics and sexual differentiation in amphibians, Comp. Biochem. Physiol. B Biochem. Mol. Biol. 133, 559-570

Kloas W, Levy G, Bögi C, Opitz R, Lutz I (2002): Effects of environmental chemicals on reproductive biology of amphibians. Proceedings of 2nd Status Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, http://www.status-umwelthormone.de, 55-58

Kloas W, Levy G, Opitz R, Bögi C, Würtz S, Oehlmann J, Schulte-Oehlmann U, Van Ballegoy C, Urbatzka R, Jagnytsch O, Lutz I (2003): Wirkungen endokrin wirksamer Substanzen auf aquatische Tiere. In : Hormonell wirksame Stoffe und Pharmaka in Gewässern 40. Tutzing-Symposium. VCH-Wiley

Kloas W, Bögi C, Levy G, Lutz I (2002): Sexual differentiation in amphibians. Proceedings of the 21st Conference of the European Comparative Endocrinologists (Bonn, Germany, 26-30 August, 2002), Monduzzi Editore

Levy G, Lutz I, Krüger A, Cato A, Kloas W (2002): Identifizierung der Gewässerbelastung durch endokrin wirksame Substanzen (endocrine disruptors) sowie deren Risikobewertung für die Reproduktionsbiologie – Amphibien als Indikator für Ökosysteme, http://www.bwplus.fzk.de/kloas.pdf, 1-12

Levy G, Bögi C, Lutz I, Opitz R, Kloas W (2002): Amphibians as model to study endocrine disruptors: I. In vivo effects on reproductive biology. Proceedings of 2nd Status-Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, http://www.status-umwelthormone.de, 99-102

Levy G, Lutz I, Opitz R, Krüger A, Kloas W (2002): Bisphenol A induces feminization in Xenopus laevis tadpoles via estrogen-response systems. Proceedings of the 21st Conference of the European Comparative Endocrinologists (Bonn, Germany, 26-30 August, 2002), Monduzzi Editore, 91-94

Lutz I, Schulz A, Levy G, Bögi C, Opitz R, Würtz S, Kloas W (2002):Establishment of estrogenreceptor-mRNA as estrogenic biomarker in the amphibian Rana temporaria. Proceedings of the 21st Conference of the European Comparative Endocrinologists (Bonn, Germany, 26-30 August, 2002), Monduzzi Editore

Opitz R, Bögi C, Levy G, Lutz I, Kloas W (2002):Development of a Xenopus metamorphosis assay (XEMA) to detect thyroid-disrupting activity of environmental chemicals.Berichte des IGB 13, http://www.igb-berlin.de

Opitz R, Levy G, Bögi C, Lutz I, Kloas W (2002): Endocrine disruption in fish and amphibians, Recent Res. Devel. Endocrinol. 3, 127-170

Opitz R, Bögi C, Levy G, Lutz I, Kloas W (2002): Amphibians as model to study endocrine disruptors: II. Bioassay development for detection of chemicals affecting thyroid system in Xenopus laevis tadpoles. Proceedings of 2nd Status-Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, http://www.status-umwelthormone.de, 217-220

Opitz R, Levy G, Lutz I, Kloas W (2002): Development of molecular biomarkers to detect thyroid-disrupting activities of environmental chemicals in Xenopus laevis tadpoles. Proceedings of the 21st Conference of the European Comparative Endocrinologists (Bonn, Germany, 26-30 August, 2002), Monduzzi Editore, 99-102

Kloas W, Levy G, Bögi C, Lutz I (2001): Welchen Einfluß haben Umweltchemikalien durch endokrine Effekte auf die Reproduktion? – Amphibien als Indikator für Ökosysteme. Zwischenbericht zu BWB 99001 der Projektträgerschaft: Baden-Württemberg, Programm Lebensgrundlage, Umwelt und ihre Sicherung (BW-PLUS), web-page: http://bwplus.fzk.de/kloas.pdf, 1-15

Kloas W, Bögi C, Levy G, Engels B, Lutz I (2000): Welchen Einfluß haben Umweltchemikalien durch endokrine Effekte auf die Reproduktion? – Amphibien als Indikator für Ökosysteme. Statusseminar der Projektträgerschaft: Baden-Württemberg, Programm Lebensgrundlage, Umwelt und ihre Sicherung (BW-PLUS), web-page: http://bwplus.fzk.de/kloas.pdf, 1-11

Kloas W, Bögi C, Levy G, Engels B, Lutz I(2000):Amphibians as a model to study endocrine disruptors: An additional risk of environmental pollution in aquatic ecosystems? Berichte des IGB 10, 131-140

Kloas W, Bögi C, Levy G, Lutz I (2002): Sexual differentiation in amphibians. Proceedings of the International Conference of the European Society for Comparative Endocrinology, Bonn, Germany, 26th-30th August, 2002

Lutz I, Schulz A, Levy G, Bögi C, Opitz R, Würtz S, Kloas W (2002):Establishment of estrogenreceptor-mRNA as estrogenic biomarker in the amphibian Rana temporaria. Proceedings of the International Conference of the European Society for Comparative Endocrinology, Bonn, Germany, 26th-30th August, 2002

Kloas W, Bögi C, Levy G, Lutz I (2001): Welchen Einfluß haben Umweltchemikalien durch endokrine Effekte auf die Reproduktion? – Amphibien als Indikator für Ökosysteme. Statusseminar der Projektträgerschaft: Baden-Württemberg, Programm Lebensgrundlage, Umwelt und ihre Sicherung (BW-PLUS). (Abstract, oral communication)

Kloas W, Bögi C, Levy G, Opitz R, Lutz I (2001): Are endocrine disruptors a threat for aquatic ecosystems – amphibians as model. Proceedings of the Meeting of the Gesellschaft für Ökologie held at Basel, August 27th-31st, 2001. (Abstract, invited lecture, 173

Kloas W, Bögi C, Levy G, Opitz R, Lutz I (2001): Amphibians as model to study endocrine disruptors. Proceedings of the International Symposium on Endocrinology and Neurobiology of Amphibians and Reptiles, Camerino, Italy, 1st-3rd June, 2001, 36 (Abstract, oral communication)

Kloas W, Levy G, Bögi C, Opitz R, Lutz I (2001): Effects of environmental chemicals on reproductive biology of amphibians. Proceedings of 2nd Status-Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, 67. (Abstract, oral communication)

Levy G, Bögi C, Lutz I, Opitz R, Kloas W (2001): Amphibians as model to study endocrine disruptors: I. In vivo effects on reproductive biology. Proceedings of 2nd Status-Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, 95. (Abstract)

Levy G, Bögi C, Lutz I, Opitz R, Kloas W (2001): In vivo effects of endocrine disruptors on reproductive biology of Xenopus laevis. Proceedings of the International Symposium on Endocrinology and Neurobiology of Amphibians and Reptiles, Camerino, Italy, 1st-3rd June, 2001, 56. (Abstract)

Opitz R, Bögi C, Levy G, Lutz I, Kloas W (2001): Amphibians as model to study endocrine disruptors: II. Bioassay development for detection of chemicals affecting thyroid system in Xenopus laevis tadpoles. Proceedings of 2nd Status-Seminar Endocrine Disrupters 2nd - 4th April 2001, Berlin, Germany, 111. (Abstract)

Opitz R, Bögi C, Levy G, Lutz I, Kloas W (2001): Validation of a bioassay (XEMA) for detection of chemicals affecting thyroid system in Xenopus laevis. Proceedings of the International Symposium on Endocrinology and Neurobiology of Amphibians and Reptiles, Camerino, Italy, 1st-3rd June, 2001, 67. (Abstract)

Kloas W, Bögi C, Levy G, Lutz I (2000): Welchen Einfluß haben Umweltchemikalien durch endokrine Effekte auf die Reproduktion? – Amphibien als Indikator für Ökosysteme. Statusseminar der Projektträgerschaft: Baden-Württemberg, Programm Lebensgrundlage, Umwelt und ihre Sicherung (BW-PLUS). (Abstract, oral communication)

Kloas W, Bögi C, Levy G, Lutz I (2000): Amphibians as model to study endocrine disruptors. Verh. Dtsch. Zool. Ges. 92.1, 87 (Abstract, oral communication)

Kloas W, Levy G, Bögi C, Lutz I (2000): In vitro and in vivo effects of bisphenol A on the amphibian Xenopus laevis. Proceedings of the International Workshop: Bisphenol A: Low Dose Effects – High Dose Effects, Berlin 18th-20th November 2000. (Abstract, oral communication)

Levy G, Bögi C, Lutz I, Kloas W (2000): In vivo effects of endocrine disruptors on sexual differentiation and biomarkers in the amphibian Xenopus laevis. Proceedings of the International Workshop: Bisphenol A: Low Dose Effects – High Dose Effects, Berlin 18th-20th November 2000. (Abstract)

Levy G, Bögi C, Kloas W (1999): In vivo effects of endocrine disruptors on sexual differentiation and biomarkers in the amphibian Xenopus laevis. Proceedings of the 9th Annual Meeting of SETAC-Europe, Leipzig, 25-29 May 1999. (Abstract)