1. The Development of the Infant and Young Child. Normal and Abnormal;Illingworth,1987
2. Observations on the development of visually-directed reaching;White;Child Dev,1964
3. Function of the nervous system during prenatal life;Humphery,1978
4. Ultrasonographic study of fetal movements;Ianniruberto;Semin Perinatol,1981
5. Fetal motility in the first half of pregnancy;de Vries,1984