1. Prematurity and pseudoprematurity. Studies of the developmental age in underweight newborns;Bergstrom, A.L.; Gunther, M.B.; Olow, I.; Soderling, B.;Acta paediat. (Uppsala),1955
2. Perinatal Mortality, table 47;Butler, N.R.; Bonham, D.G.,1963
3. L'electroencephalogramme: critere d'age conceptionnel du nouveau-ne it terme et prematur;Dreyfus-Brisac, C.; Flescher, J.; Plassart, E.;Biol. Neonat. (Basel),1962
4. The value of some external characteristics in the assessment of gestational age at birth;Farr, V.; Kerridge, D.F.; Mitchell, R.G.;Develop. Med. Child. Neurol,1966
5. The definition of some external characteristics used in the assessment of gestational age in the newborn infant;Farr, V.; Kerridge, D.F.; Mitchell, R.G.; Mitchell, R.G.; Neligan, G.A.; Parkin, J.M.;ibid,1966