Ricardo Gaitán., Albino Hernández-Galeana., . and Roberto Martínez. (1991) “Some issues on spontaneous symmetry breaking”, Revista Mexicana de Física, 38(5), pp. 846–849. Available at: https://rmf.smf.mx/ojs/index.php/rmf/article/view/2282 (Accessed: 5 July 2024).