1. A survey of 400 cases of cerebral palsy in childhood;Asher, P.; Schonell, F.E.;Arch. Dis. Childh,1950
2. A longitudinal study of the growth and development of prematurely and maturely born children;Drillien, C.M.;Ibid,1959
3. Clinical approach to the etiology of cerebral palsy;Greenspan, L.; G, Deaver G.;Arch. phys. Med,1953
4. Recent Advances in Cerebral Palsy;Illingworth, R.S.,1958
5. L'evolution de l'intelligence des jumeaux;Looft, C.;Acta paediat. (Uppsala),1931