1. Reproductive ultrasound of the bitch and queen;Davidson;Top Companion Anim Med,2009
2. Ultrasonographic appearance of the ovaries of dogs during the follicular and luteal phases of the estrous cycle;Wallace;Am J Vet Res,1992
3. The urogenital apparatus;Christensen,1979
4. Female genitalia;Ellenport,1975
5. Ultrasound evaluation of the ovary;Neiman,1988