Cain J L
Bishop Ranch Veterinary Center, San Ramon, California, USA.
Vet Clin North Am Small Anim Pract. 2001 Mar;31(2):237-45. doi: 10.1016/s0195-5616(01)50202-8.
This approach to infertility in the bitch describes what diagnostic methods to perform and what thought processes to consider at different phases of the estrous cycle.