Template:Ref-Swift1914
From Embryology
Swift CH. Origin and early history of the primordial germ-cells in the chick. (1913) Amer. J Anat. 15(4): 483-514.
Swift CH. Origin and early history of the primordial germ-cells in the chick. (1913) Amer. J Anat. 15(4): 483-514.