GUPTA, MEENAKSHI, et al. “Potential Role and Influence of Zero Tillage Technology on Energy Saving in Rice (Oryza Sativa)- Wheat (Triticurn Aestivum) System”. The Indian Journal of Agricultural Sciences, vol. 77, no. 10, Jan. 2011, https://epubs.icar.org.in/index.php/IJAgS/article/view/3434.