Singh, Jagdeep, et al. “Effect of Nitrogen and Zinc on Growth and Yield of Maize (Zea Mays L.)”. International Journal of Bio-Resource and Stress Management, vol. 12, no. Jun, 3, June 2021, pp. 179-85, https://ojs.pphouse.org/index.php/IJBSM/article/view/4091.