1. Anderson, M., Went, L. N., MacIvet, J. E. and Dixon, H. G. (1960).Lancet 2, 516.
2. Babson, S. G.et al. (1964). Cited from Chandra, 1967..
3. Baird, D. (1964). The epidemiology of prematurity.J. Pediat. 65, 909.
4. Ball, R. P. and Golden, R. (1943).Amer. J. Roentgenol. 49, 731.
5. Baumgartner, L. (1962). The public health significance of low birth weight in the U.S.A. with special reference to varying practices in providing special care to infants of low birth weight.Bull. World. Hlth. Organ. 26, 175.