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<p>Silverman, op. cit., Terman and Tyler, op. cit.; R. Q. Bell and N. S. Costello, »Three Tests for Sex Differences in Tactile Sensitivity in the New Born,« Biologia Neonatorum 7 (1964): 335-347; R. Q. Bell and J. F. Darling, »The Prone Head Reaction in the Human Neonate: Relation with Sex and Tactile Sensitivity,« Child Development 36 (1965):943-949; S. M. Garn, »Roentgenogrammetric Determinants of Body Composition,« Human Biology 29 (1957): 337-353; J. Kagan and M. Lewis, »Studies of Attention in the Human Infant,« Merrill-Palmer Quarterly 2 (1965): 95-127; M. Lewis, J. Kagan, and J.