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Ingalls, T. E.; Pugh, T. J., and MacMahon, B.: Incidence of Anencephalus, Spina Bifida, and Hydrocephalus Related to Birth Rank and Maternal Age , Brit. J. Prev. Soc. Med. 8:17, 1954;.
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Böök, J. A., and Fraccarro, M.: Research on Congenital Malformations , Biol. Neonat. 5:39, 1956;.
Böök, J. A.: The Incidence of Congenital Diseases and Defects in a South Swedish Population , Acta Genet. 2:289, 1951;.
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Harris, L. E., and Steinberg, A. G.: Abnormalities Observed During the First 6 Days of Life in 8,716 Live-born Infants , Pediatrics 14:314, 1954;.
Stevenson, A. C., and Warnock, H. A.: Observations on the Results of Pregnancies in Women-Resident in Belfast: I. Data Relating to All Pregnancies Ending in 1957 , Ann. Hum. Genet. 23:382, 1959;.
Kurland, L. T.: Descriptive Epidemiology of Selected Neurologic and Myopathic Disorders with Particular Reference to a Survey in Rochester, Minnesota , J. Chron. Dis. 8:378, 1958;.
Wallace, H. M.; Baumgartner, L., and Rich, H.: Congenital Malformations and Birth Injuries in New York City , Pediatrics 12:525, 1953;.