BOMM, H. Zum Tode von Helmuth Erkert. Backnanger Jahrbuch, [S. l.], v. 5, p. 276–277, 1997. DOI: 10.53458/bjb.v5i.8897. Disponível em: https://journals.wlb-stuttgart.de/ojs/index.php/bjb/article/view/8897. Acesso em: 23 juli. 2024.