Omes, Claudia, Antonia Icaro Cornaglia, Federica Riva, Monica Savio, Giuliano Mazzini, Anna Marchetti, Chiara Sanarica, et al. 2015. “Ultrastructural Features of Human Sperm Cells Cryopreserved by Different Methods”. Italian Journal of Anatomy and Embryology 120 (1):39. https://oajournals.fupress.net/index.php/ijae/article/view/3993.