Manothaiudom K, Johnston SD, Hegstad RL, et al., 1995: Evaluation of the accuracy of the ICAGEN-Target Canine Ovulation Timing Diagnostic Test in detecting canine plasma progesterona concentrations. J Am Anim Hosp Assoc 31, 57-64.

Mellea M, 2006: La gestione della riproduzione nell’allevamento canino. Tesis Doctoral. Universita’ di Pisa.

Mialot JP, 1984: Pathologie de la Reproduction chez les Carnivores Domestiques. Maisons-Alfort, Point Veterinaire, pp:192.

Olson PN, 1989: Exfoliative cytology of the canine reproductive tract. Proceedings of the Annual Meeting of the Society for Theriogenology, Coeur d’Alene, ID, September 29-30. Nashville, Society for Theriogenology.

Olson PN, Bowen RA, Behrendt MD et al., 1982: Concentrations of reproductive hormones in canine serum throughout late anestrus, proestrus and estrus. Biol Reprod 27, 1196-1206.

Olson PN et al., 1983: Infertility in the bitch. In Kirk RW (ed): Current Veterinary Therapy VIII. Philadelphia, WB Saunders Co, p 925.

Papanicolaou GN, 1954: A new procedure for staining vaginal smears. Science 95, 432.

Pérez CC, Rodríguez I, Dorado J, Hidalgo M, 2005: Use of ultrafast Papanicolaou stain for exfoliative vaginal cytology in bitches. Veterinary Record 156, 648-50.

Phemister RD, Holst PA, Spano JS, 1973: Time of ovulation in the beagle bitch. Biol Reprod 8, 74-82.

Post K, 1985: Canine vaginal cytology during the estrous cycle. Can Vet J 26, 101-4.

Roszel JF, 1975: Genital cytology of the bitch. Veterinary Scope XIX, 2-15.

Roszel JF, 1977: Normal canine vaginal cytology. Veterinary Clinics of North America: Small Animal Practice 7, 667-81.

Tammer I, Blendinger K, Sobiraj A, Bostedt H, 1994: The use of exfoliative vaginal cytology for the gynaecological evaluation of the bitch. Tierärztliche Praxis 22, 199-207.

Wildt DE, Chakraborty PK, Panko WB et al., 1978: Relationship of reproductive behaviour, serum luteinizing hormone and time of ovulation in the bitch. Biol Reprod 18, 561-70.

Wildt DE, Panko WB, Chakraborty et al., 1979: Relationship of serum estrone, estradiol-17beta and progesterone to LH, sexual behaviour and time of ovulation in the bitch. Biol Reprod 20, 649-58.

Wright RJ, Parry BW, 1989: Cytology of the canine reproductive system. Veterinary Clinics of North America: Small Animal Practice 19, 851-74.