Pérez-Lorenzana, A., Ponce, W. A., . and Arnulfo Zepeda. (1999) “Nonsupersymmetric Gauge Coupling Unification in [SU(6)]4 X Z4 and Proton Stability”, Revista Mexicana de Física, 45(2), pp. 109–121. Available at: https://rmf.smf.mx/ojs/index.php/rmf/article/view/2834 (Accessed: 5 July 2024).