Sharma, Vasu, et al. “Multimodal Approaches for Canine Estrus Detection Through Vaginal Electrical Resistance, Vaginal Cytology, Vaginoscopy and Progesterone Profile”. The Indian Journal of Animal Reproduction, vol. 46, no. 4, Feb. 2026, pp. 22-26, https://doi.org/10.48165/ijar.2025.46.04.4.