M. K. Singh, S. Pashupalak, S. K. Pal, R. Thakur, and U. N. Verma, “Effect of fertilizer and plant-density management on productivity and economics of maize (Zea mays) + blackgram (Phaseolus mungo) intercropping”, Indian J Agri Sci, vol. 65, no. 11, Jun. 2012, Accessed: Oct. 29, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/19111