NIEVES ESCOBAR, Nery Job. Optimización en espacios normados. Pro Mathematica, [S. l.], v. 9, n. 17-18, p. 135–148, 1995. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10201. Acesso em: 12 dic. 2025.