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2. Pathogenic factors in idiopathic mental retardation;Costeff;Dev. Med. Child Neurol.,1981
3. Studies in mental handicap. II. Some obstetric factors of possible aetiological significance;Drillien;Arch. Dis. Childh.,1968
4. Association of characteristics of retarded patients and their families with speed of institutionalization;Eyman;Am. J. ment. Defic.,1966
5. Factors determining residential placement of mentally retarded children;Eyman;Am. J. ment. Defic.,1972