D.C. NAYAK AND S.K. SINGH, S.K. Reza*, S.K. Ray. 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, India, v. 66, n. 1, 2018. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/80695. Acesso em: 16 jul. 2026.