1. Ylppo, A.: Quoted by Yerushalmy and associates.8
2. final report, technical report series No. 27;World Health Organization Expert Group on Prematurity,1950
3. Study of physiological maturity in premature newborn;Raghviah;Indian J. Child Health,1962
4. Assessment of gestational age by neurological examination;Robinson;Arch. Dis. Childhood,1966
5. Standards of prematurity for North Indian babies;Ghosh;Indian J. Child Health,1962