[1] Univ Guanajuato, Dept Ingn Minas Met & Geol, Div Ingn, Sede San Matias, Campus Guanajuato,Ex Hacienda San Matias S-N, Guanajuato 36050, Mexico
[2] Univ Guanajuato, Dept Ingn Civil & Ambiental, Div Ingn, Sede Belen, Campus Guanajuato,Juarez 77, Guanajuato 36000, Mexico