Tassinari, V., F. Campolo, S. Dolci, and P. Rossi. “FGF9 – Nodal Signaling Negatively Control Meiotic Entry of Postnatal Male Germ Cells”. Italian Journal of Anatomy and Embryology, vol. 118, no. 2, Jan. 2014, p. 181, https://oajournals.fupress.net/index.php/ijae/article/view/3885.