1. Inguinal hernias;Snyder, W.H.; Greaney, F.M.,1969
2. Inguinal hernias are common in preterm infants;Boocock, G.R.; Todd, P.J.;Arch Dis Child,1985
3. Birthweight between 14 and 42 weeks';Keen, D.V.; Pearse, R.G.;gestation. Arch Dis Child,1985
4. SPSS-X (Statistical Package for the Social Sciences) user's guide;Nie, N.H.,1983
5. The GLIM system release 3 manual. Generalised linear interactive mnodelling;Baker, R.J.; Nelder, J.A.,1978