1. Aggression: Some definition and some physiology;Davies;Politics and the Life Sciences,1967
2. Frustration and aggression;Dollard,1939
3. Why war?;Einstein,1933
4. The brain in relation to empathy and medical education;MacLean;Journal of Nervous and Mental Disease,1972
5. A proposed mechanism of emotion;Papez;Archives of Neurology and Psychiatry,1937