PRAKASH, B S, et al. “Development of a Sensitive, Direct Enzyme Immunoassay for Progesterone Determination in Follicular Fluid from Individual Buffalo Ovarian Follicles”. The Indian Journal of Animal Sciences, vol. 67, no. 8, Nov. 2013, https://epubs.icar.org.in/index.php/IJAnS/article/view/34882.