D.C. Nayak and S.K. Singh, S.K. Reza*, S.K. Ray. 2018. “Geostatistical and Multivariate Analysis of Heavy Metal Pollution of Coal-Mine Affected Agricultural Soils of North-Eastern India”. Journal of the Indian Society of Soil Science 66 (1). https://epubs.icar.org.in/index.php/JISSS/article/view/80695.