Nivedita Oinam, R.K. Kumarjit Singh, and Herojit Singh Athokpam. “Critical Limits of Zinc in Soil and Rice Plant in Valley Soils of Manipur”. International Journal of Advance Research in Engineering, Science & Technology, vol. 4, no. 9, Sept. 2017, pp. 76-83, https://ijarest.org/index.php/ijarest/article/view/1726.