MEHLA, D S, and A P GUPTA. “Optimum Fertilizer Nitrogen Dose for Wheat (Triticum Aestivum) Varieties under Rice (Oryza Sativa)-Wheat Cropping Sequence”. The Indian Journal of Agricultural Sciences, vol. 68, no. 6, Feb. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/27565.