(1990). Chemistry and biology of pteridines 1989: Pteridines and folic acid derivatives ; proceedings of the Ninth International Symposium on Pteridines and Folic Acid Derivatives, Chemical, Biological and Clinical Aspects, Zurich, Switzerland, September 3 - 8, 1989. <<de>> Gruyter.
Chicago-Zitierstil (17. Ausg.)Chemistry and Biology of Pteridines 1989: Pteridines and Folic Acid Derivatives ; Proceedings of the Ninth International Symposium on Pteridines and Folic Acid Derivatives, Chemical, Biological and Clinical Aspects, Zurich, Switzerland, September 3 - 8, 1989. Berlin ; New York: <<de>> Gruyter, 1990.
MLA-Zitierstil (9. Ausg.)Chemistry and Biology of Pteridines 1989: Pteridines and Folic Acid Derivatives ; Proceedings of the Ninth International Symposium on Pteridines and Folic Acid Derivatives, Chemical, Biological and Clinical Aspects, Zurich, Switzerland, September 3 - 8, 1989. <<de>> Gruyter, 1990.