Ruiz Sibaja, A., & Bonilla Manterola, O. (2010). An stiffness coefficients proposal for thin walled open beams. Rev. Téc. Fac. Ing. Univ. Zulia, 29(3). Recuperado a partir de http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/6029