1. Text-Atlas of cat anatomy;Crouch,1969
2. Physiology and endocrinology of reproduction in female cats;Verstegen,2010
3. Ovaries and uterus;Matton,2002
4. Feline breeding management;Schmidt;Vet Clin North Am Small Anim Pract,1986
5. Infertility from noninfectious causes;Herron,1986