VON LUDWIGER, Illobrand; NAHM, Michael. Apport phenomena of medium Herbert Baumann (1911-1998): Report on personal experiences. Journal of Scientific Exploration, [S. l.], v. 30, n. 4, 2016. Disponível em: https://journalofscientificexploration.org/index.php/jse/article/view/1048. Acesso em: 9 may. 2026.