1. Social Interaction;Argyle,1969
2. Activity patterns of rhesus monkeys in a social group;Bernstein;Animal Behavior,1963
3. Fish schooling: a possible factor in reducing predation;Brock;Journal du Conseil Permanent International pour l'Exploration de la Mer,1960
4. Hexagonal packing of royal tern nests;Buckley;Auk,1977
5. Measurement of spatial behavior;Burgess;Behavioral and Neural Biology,1979