Template:Ref-BeamsSheehan1941
From Embryology
Beams HW. and Sheehan JF. The yolk nucleus complex of the human ovum. (1941) Anat. Rec. 81: 545-554.
Beams HW. and Sheehan JF. The yolk nucleus complex of the human ovum. (1941) Anat. Rec. 81: 545-554.