D. Sousa Zanoni, G. Alegro Da Silva, J. L. Laus, and R. Laufer Amorim, “Glaucoma, apoptosis and sildenafil: comprehension of a disease without solution and a possible approach of treatment: Comprehension of a disease without solution and a possible approach of treatment”, RVZ, vol. 23, no. 4, pp. 577–587, Dec. 2016.