1. Birth counts. Statistics ofpregnancy and childbirth;Macfarlane, A.; Mugford, M.,1984
2. Ocular sequelae of preterm birth and their relation to ultrasound evidence of cerebral damage;Hungerford, J.; Stewart, A.; Hope, P.;BrJ Ophthalmol,1986
3. Ocular morbidity in infants of very low birth weight;Keith, C.G.; Kitchen, W.H.;BrJ Ophthalmol,1983
4. Screening tests for hearing and vision impairment. How and when are they done?;Johnson, A.;Health Visitor,1986
5. Population Censuses and Surveys. Key population and vital statistics;Office of;Series VS,1988