BANSAL, R L, and V K NAYYAR. “Critical Level of Deficiency for Predicting Response to Manganese Application of Egyptian Clover (Trifolium Alexandrinum) on Typic Ustochrepts*”. The Indian Journal of Agricultural Sciences, vol. 67, no. 9, May 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/30044.