Singh, S.P., Shukla, S. and Khanna, K.R. (2012) “Diallel analysis for combining ability in opium poppy (Papaver somniferum)”, The Indian Journal of Agricultural Sciences, 65(4). Available at: https://epubs.icar.org.in/index.php/IJAgS/article/view/18221 (Accessed: 26 October 2025).