1. Hale, F. (1932) Pigs born without eyeballs. J Hered
24, 105–9.
2. Warkany, J. (1971) Congenital malformations induced by maternal dietary deficiency: Experiments and their interpretation. Harvey Lec, 1952–1953 18, 89–102.
3. Warkany, J. (1971) Congenital Malformations. Notes and Comments. Year Book Medical Publications, Chicago, IL.
4. Nelson, M.M. (1955) Mammalian fetal development and antimetabolities. In: Rhoads EP, ed. Antimetabolites and Cancer. American Association for the Advancement of Science Monograph, Washington D.C.
5. Evans, H.M., Nelson, M.M., Asling, C.V. (1951) Multiple congenital abnormalities resulting from acute folic acid deficiency during gestation. Science
114, 479.