R. Srinivasan, et al. “Influence of Copper Oxide and Zinc Oxide Nano-Particles on Growth of Fodder Cowpea and Soil Microbiological Properties”. Range Management and Agroforestry, vol. 38, no. 2, Oct. 2021, pp. 208-14, https://publications.rmsi.in/index.php/rma/article/view/225.