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2. A Program of Stimulation for Infants Born Prematurely;Barnard,1975
3. Neonatal separation, the maternal side of interactional deprivation;Barnett;Pediatrics,1970
4. Bayley Scales of Infant Development;Bayley,1969
5. Behavioral competence of the newborn infant;Bayley;Semin. Perinatol.,1979