@article{Quiroga Gonzáles_Límaco_Barreto_2006, title={The penalty method and beam evolution equations}, volume={20}, url={https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10237}, number={39-40}, journal={Pro Mathematica}, author={Quiroga Gonzáles, Cruz and Límaco, Juan and Barreto, Rioco}, year={2006}, month={sep.}, pages={41-63} }