Template:Ref-Gruenwald1941b
From Embryology
Gruenwald P. Early human twin embryo attached to other twin and not to the chorion. (1941) Anat. Rec. 79: 27-28.
Gruenwald P. Early human twin embryo attached to other twin and not to the chorion. (1941) Anat. Rec. 79: 27-28.