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4. The genetics of the major central nervous system malformations, based on the South Wales sociogenetic investigation;CARTER, C.O.; LAWRENCE, K.M.; DAVID, P.A.;Develop. Med. Child. Neurol,1967
5. Congenital malformations in African neonates in Nairobi;KHAN, A.A.;J. trop. Med. Hyg,1965