SÁNCHEZ GUTIÉRREZ, Roy Wil; CHAU PÉREZ, Norberto Jaime. Curvas y superficies. En Blanco y Negro, [S. l.], v. 3, n. 1, p. 11–25, 2012. Disponível em: https://revistas.pucp.edu.pe/index.php/enblancoynegro/article/view/2893. Acesso em: 28 dic. 2025.