1. Home environments of developmentally disabled infants as a function of parent and infant characteristics;Affleck;Amer. J ment. Defic.,1982
2. Evaluation of teaching methods in a home-based training scheme for developmentally delayed, pre-school children;Bidder;Child,1983
3. The development of object permanence. Some studies of existence constancy;Bower;Percept. Psychophys.,1967
4. Comparison of two procedures for fostering the development of the object construct;Brasell;Amer. J. ment. Defic.,1976