KEIL, Klaus; PARKER, Gerald; RAHN, Jay; WEHRLE, Marlene. Helmut Kallmann: Memories and Tributes. CAML Review / Revue de l’ACBM, [S. l.], v. 40, n. 2, 2012. DOI: 10.25071/1708-6701.35775. Disponível em: https://caml.journals.yorku.ca/index.php/caml/article/view/35775. Acesso em: 5 may. 2024.