A. Ganesan, et al. “Comparison of Endocervical and Endometrial Cytology to Diagnose Sub- Clinical Endometritis in Repeat Breeding Cows”. Indian Journal of Veterinary and Animal Sciences Research, vol. 49, no. 1, Jan. 2023, pp. 14-18, https://epubs.icar.org.in/index.php/IJVASR/article/view/132141.