RISCHEL, Hans. Holomorphe Überlagerungskorrespondenzen. MATHEMATICA SCANDINAVICA, [S. l.], v. 15, p. 49–63, 1964. DOI: 10.7146/math.scand.a-10726. Disponível em: https://tidsskrift.dk/math/article/view/10726. Acesso em: 14 aug. 2026.