SCHNEITER, Rudolf. Erstmalige Verleihung des Paul Rhyner-Preises an Prof. Dr. Josef Portmann. CHIMIA, [S. l.], v. 47, n. 12, p. 456, 1993. Disponível em: https://www.chimia.ch/chimia/article/view/1993_456. Acesso em: 2 may. 2024.