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2. The effect of sex, social class and parity on achievement of Denver Developmental Screening Test items in the first year of life;Bryant;Dev. Med. Child Neurol.,1974
3. From Birth to Seven;Davie,1972
4. The Home and the School;Douglas,1976
5. Differences in age of walking in five European longitudinal samples;Hindley;Hum. Biol.,1966