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2. Infancy and the optimal level of stimulation. Greenberg DJ, O'Donnell WJ. Child Dev; 1972 Jun; 43(2):639-45. PubMed ID: 5034736 [No Abstract] [Full Text] [Related]
3. Conservation of vertical-horizontal space perception in trainable retarded children. Kershner JR. Am J Ment Defic; 1973 May; 77(6):710-6. PubMed ID: 4726473 [No Abstract] [Full Text] [Related]
5. Children's awareness of their bodily appearance: a developmental study of factors associated with the body percept. Gellert E, Girgus JS, Cohen J. Genet Psychol Monogr; 1971 Aug; 84(1):109-74. PubMed ID: 5148684 [No Abstract] [Full Text] [Related]
7. Exploratory manipulation and play in the human infant. McCall RB. Monogr Soc Res Child Dev; 1974 Aug; 39(2):1-88. PubMed ID: 4444723 [No Abstract] [Full Text] [Related]
8. Haptic-visual shape matching by mentally retarded children: exploratory activity and complexity effects. Davidson PW, Pine R, Wiles-Kettenmann M, Appelle S. Am J Ment Defic; 1980 Mar; 84(5):526-33. PubMed ID: 7361830 [Abstract] [Full Text] [Related]
9. Developmental stages for decoding symmetry in retarded and gifted children. Paraskevopoulos I. Am J Ment Defic; 1968 Nov; 73(3):447-54. PubMed ID: 5699746 [No Abstract] [Full Text] [Related]
19. The development of conservation and horizontal-vertical space perception in mental retardates. Stearns K, Borkowski JG. Am J Ment Defic; 1969 Mar; 73(5):785-90. PubMed ID: 5780064 [No Abstract] [Full Text] [Related]