Muñoz Lazo, A., J. A. Mena Lorenzo, and J. A. Conill Armenteros. “Professional Improvement in contact Lenses in Pinar Del Río. Historical Evolution”. Mendive. Journal on Education, vol. 18, no. 2, May 2020, pp. 193-05, https://mendive.upr.edu.cu/index.php/MendiveUPR/article/view/1761.