Template:Ref-Thing1918
From Embryology
Thing A. The formation and structure of the zona pellucida in the ovarian eggs of turtles. (1918) Amer. J Anat. 23: 237-257.
Thing A. The formation and structure of the zona pellucida in the ovarian eggs of turtles. (1918) Amer. J Anat. 23: 237-257.