Mohan, Jasna J., Rajesh Kumar Jha, G. Pradeep Kumar, Arun M. Dharmarajan, and Malini Laloraya. 2007. “Secreted Frizzle-Related Protein (sFRP4) Can Abrogate Pregnancy - A New Dimension in Its Biological Role”. Journal of Endocrinology and Reproduction 11 (1):41-44. https://informaticsjournals.co.in/index.php/jer/article/view/2134.