KATYAL, V, S K SHARMA, and K S GANGWAR. 2013. “Stability Analysis of Rice (Oryza Satiya)-Wheat (Triticum Aestivum) Cropping System in Integrated Nutrient Management”. The Indian Journal of Agricultural Sciences 68 (2). https://epubs.icar.org.in/index.php/IJAgS/article/view/27299.