1. Animal aggregations: A study in general sociology;Allee,1931
2. Retarded development of Ostertagia in sheep;Dunsmore;Nature, London,1960
3. The adaptiveness of polymorphism in Haemonchus contortus;LeJambre,1971
4. Some observations on the worm burdens of calves in fected daily with Ostertagia ostertagi;Michel;Parasitology,1969
5. Seasonal polymorphism in a parasitic nematode caused by differential responses to increasing population density;Ractliffe,1971