QUIROGA GONZÁLES, Cruz Sonia; LÍMACO, Juan; BARRETO, Rioco K. The penalty method and beam evolution equations. Pro Mathematica, [S. l.], v. 20, n. 39-40, p. 41–63, 2006. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10237. Acesso em: 7 dic. 2025.