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2. Response to novelty: Continuity vs. discontinuity in the developmental course of intelligence;Berg,1985
3. Self-produced locomotion: An organizer of emotional, cognitive, and social development in infancy;Bertenthal,1984
4. Continuity in mental development from infancy;Bornstein;Child Development,1986
5. GRASP: Graphics Animation Software for Professionals;Bridges,1990