Chandrakar, Upasana, et al. “Efficacy of Progesterone Receptor Antagonist for Treatment of Pyometra in Bitches ”. Indian Journal of Veterinary Sciences and Biotechnology, vol. 17, no. 4, Oct. 2021, pp. 41-45, https://acspublisher.com/journals/index.php/ijvsbt/article/view/2326.