RISCHEL, H. Holomorphe Überlagerungskorrespondenzen. MATHEMATICA SCANDINAVICA, [S. l.], v. 15, p. 49–63, 1964. DOI: 10.7146/math.scand.a-10726. Disponível em: https://www.mscand.dk/article/view/10726. Acesso em: 20 may. 2024.