MASAL'TSEV, L. A. Harmonic Properties of Gauss Mappings in $H^3$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 4, p. 489–499, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3922. Acesso em: 6 dec. 2025.