1. External factors in sexual periodicity;Amoroso,1960
2. Patterns of Mammalian Reproduction;Asdell,1964
3. Studies of neuroendocrine mechanisms influencing seasonal variations in semen production and plasma hormone levels in rams;Barrell,1976
4. The genetical implications of domestication in animals;Berry,1969
5. A study of the reproductive performance of mature Romney and Merino rams throughout the year;Bremner,1984