KUMAR, ANIL, et al. “Effect of Blackgram (phaseolus Mungo) Varieties and Fertility Levels on Performance of Maize (Zea Mays) + Blackgram Intercropping System under Rainfed Condition *”. The Indian Journal of Agricultural Sciences, vol. 72, no. 11, June 2014, https://epubs.icar.org.in/index.php/IJAgS/article/view/41164.