https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.who.int/reproductivehealth/publications/infertility//en/&ved=2ahUKEwiSm6_Cx_LrAhVAAWMBHXuOBNIQFjAIegQIARAB&usg=AOvVaw3svKKPAX97FMKO-xrI3Ihg


http://www.embryology.ch/anglais/cgametogen/spermato03.html

https://cnx.org/contents/be859764-a7a5-4c03-8415-fcb06e44a4b7:2a9ada93-7f2c-4a25-9738-ff1c86f0eaa0

https://en.m.wikipedia.org/wiki/Spermatogenesis#:~:text=Spermatogenesis%20is%20the%20process%20by,are%20called%20spermatogonial%20stem%20cells.

https://www.britannica.com/science/spermatogenesis

https://rbej.biomedcentral.com/articles/10.1186/1477-7827-1-107

https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/spermatogenesis