Hirsch, M.; Lunenfeld, B.; Modan, M.; Ovadia, J.; Shemesh, J. (1985). “Spermarche--the age of onset of sperm emission”. J Adolesc Health Care. doi:10.1016/s0197-0070(85)80103-0.
Janczewski, Z.; Bablok, L. (1985). “Semen Characteristics in Pubertal Boys”. Archives of Andrology15 (2-3): 199-205. doi:10.3109/01485018508986912. PMID3833078.