1. Gruenwald, P.: Infants of low birth weight among 5,000 deliveries. Pediatrics, 34:157, 1964.
2. Usher, R.H.: Clinical and therapeutic aspects of fetal malnutrition. Ped. Clin. N. Amer., 17: 169, 1970.
3. Laga, E.M., Driscoll, S.G. and Munro, H.N.: Comparison of placentas from two socioeconomic groups. I. Morphometry. Pediatrics, 50:24, 1972.
4. Winick, M.: Cellular growth of human placenta. III. Intrauterine growth failure. J. Pediat., 71:390, 1967.
5. Rosado, A., Bernai, A., Sosa, A., Morales, M., Urrusti, J., Yoshida, P., Frenk, S., Velasco, L., Yoshida, T. and Metcoff, J.: Human fetal growth retardation. III. Protein, DNA, RNA, adenine nucleotides and activities of the enzymes pyruvic and adenylate kinase in placenta. Pediatrics, 50:568, 1972.