Dash, Anshurekha, and SHUVENDU SHEKHAR MOHAPATRA. “Toxic Effect of Urea on Earthworms Determined by a Simple Paper Contact Method”. Innovare Journal of Agricultural Sciences, vol. 6, no. 1, June 2018, pp. 17-19, https://www.journals.innovareacademics.in/index.php/ijags/article/view/24318.