Template:Ref-Heuser1954
From Embryology
Heuser CH. Monozygotic twin human embryos with an estimated ovulation age of 17 days. (1954) Anat. Rec., 118: 310.
Heuser CH. Monozygotic twin human embryos with an estimated ovulation age of 17 days. (1954) Anat. Rec., 118: 310.