Quiroga Gonzáles, Cruz, Juan Límaco, y Rioco Barreto. The Penalty Method and Beam Evolution Equations. Pro Mathematica 20, no. 39-40 (septiembre 7, 2006): 41-63. Accedido abril 25, 2024. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10237.