A.K. Dwivedi, Risikesh Thakur and Muneshwar Singh, Gajendra Patel, B.S. Dwivedi,. “Long-Term Effect of Nutrient Management on Soil Biochemical Properties in a Vertisol under Soybean–Wheat Cropping Sequence”. Journal of the Indian Society of Soil Science, vol. 66, no. 2, Sept. 2018, https://epubs.icar.org.in/index.php/JISSS/article/view/83011.