Angulo, W., and E. Colmenarez. “Heat Conduction in Perforated Metal Plates. Part I: Model and Weak Solution in a Step of Time”. Publicaciones En Ciencias Y Tecnología, vol. 1, no. 1, July 2007, pp. 33-38, https://revistas.uclave.org/index.php/pcyt/article/view/1399.