RISCHEL, Hans. Holomorphe Überlagerungskorrespondenzen. Mathematica Scandinavica, Berkeley, CA, United States, v. 15, p. 49–63, 1964. DOI: 10.7146/math.scand.a-10726. Disponível em: https://journals.msp.org/mscand/article/view/2617. Acesso em: 25 jul. 2026.