Singh, S P, Sudhir Shukla, and K R Khanna. “Diallel Analysis for Combining Ability in Opium Poppy (Papaver Somniferum)”. The Indian Journal of Agricultural Sciences 65, no. 4 (May 25, 2012). Accessed July 4, 2026. https://epubs.icar.org.in/index.php/IJAgS/article/view/18221.