M. Michael Aruldhas, G. Rajendiran, S. Subramanian, S. Dharmalingam, and P. Govindarajulu, “4(R)-5, 10, Seco 19-Norpregna 4,5 Diene 3, 10, 20 Trione (Seco), an Inhibitor of Epididymal 5α-Reductase Arrests Sperm Forward Motility in Wistar Rats”, JER, vol. 3, no. 1&2, pp. 95–111, Dec. 1999.