Salvolini, E., A. Vignini, G. Lucarini, E. Buldreghini, M. Orciani, and G. Balercia. “Production of Nitric Oxide and Peroxynitrite by Human Spermatozoa: A Role in Male Infertility?”. Italian Journal of Anatomy and Embryology, vol. 117, no. 2, Feb. 2013, p. 169, https://oajournals.fupress.net/index.php/ijae/article/view/4355.