Marín, J., R. Aceves, R. Rosas, and S. Grijalva. “Color Centers Envisioned As Confined Quantum Systems: The Case of F, F’ and F$_{2}^{+}$ Centers”. Revista Mexicana De Física E, vol. 54, no. 1 Jan-Jun, Jan. 2008, pp. 25-31, https://rmf.smf.mx/ojs/index.php/rmf-e/article/view/4561.