GUCCIONE, J.A.; GUCCIONE, J.J.; VALQUI, C. A short proof of Jung’s theorem. Pro Mathematica, [S. l.], v. 29, n. 58, p. 117–127, 2016. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/15901. Acesso em: 24 dic. 2025.