S. P. Singh, S. Shukla, and K. R. Khanna, “Diallel analysis for combining ability in opium poppy (Papaver somniferum)”, Indian J Agri Sci, vol. 65, no. 4, May 2012, Accessed: Oct. 26, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/18221