Template:Ref-O'Rahilly1985
From Embryology
O'Rahilly, R., and F. Muller, 1985. The origin of the ectodermal ring in staged human embryos of the first 5 weeks. Acta anat., 122, 145-157.
O'Rahilly, R., and F. Muller, 1985. The origin of the ectodermal ring in staged human embryos of the first 5 weeks. Acta anat., 122, 145-157.