1. Research in activity level;Cromwell,1963
2. Activity in the human newborn;Gordon;Psychological Reports,1961
3. Activity level and intellectual functioning in normal preschool children;Maccoby;Child Development,1965
4. An objective measure of hyperactivity;Schulman;American Journal of Mental Deficiency,1959
5. Brain damage and behavior: a clinical-experimental study;Schulman,1965