(EN) Kinne-Saffran e Kinne RK., Vitalism and synthesis of urea. From Friedrich Wöhler to Hans A. Krebs., in American Journal of Nephrology, vol. 19, n. 2, Karger Publishers, 1999, ISSN 0250-8095 (WC · ACNP), PMID10213830.
(EN) Kinne-Saffran e Kinne RK., Vitalism and synthesis of urea. From Friedrich Wöhler to Hans A. Krebs., in American Journal of Nephrology, vol. 19, n. 2, Karger Publishers, 1999, ISSN 0250-8095 (WC · ACNP), PMID10213830.
(EN) Kinne-Saffran e Kinne RK., Vitalism and synthesis of urea. From Friedrich Wöhler to Hans A. Krebs., in American Journal of Nephrology, vol. 19, n. 2, Karger Publishers, 1999, ISSN 0250-8095 (WC · ACNP), PMID10213830.