Rubio, E.M., Domingo, R., González, C. and Sanz, A. 2004. Comparative analysis of triangular rigid zone models in the mechanical study of drawing processes by upper bound. Revista de Metalurgia. 40, 1 (Feb. 2004), 46–55. DOI:https://doi.org/10.3989/revmetalm.2004.v40.i1.242.