Template:Ref-RockHertig1949
From Embryology
Rock J. and Hertig AT. Two human ova of the pre-villous stage, having a developmental age of about 8 and 9 days respectively. (1949) Contrib. Embryol., Carnegie Inst. Wash. Publ. 583, 33: 169-186.
Rock J. and Hertig AT. Two human ova of the pre-villous stage, having a developmental age of about 8 and 9 days respectively. (1949) Contrib. Embryol., Carnegie Inst. Wash. Publ. 583, 33: 169-186.