S.P., Bhardwaj; A.N., Pathak. Carbon, Nitrogen, phosphorous and sulphur contents of Kanpur soils. Journal of Soil and Water Conservation, India, v. 17, n. 1 & 2, 2022. Disponível em: https://epubs.icar.org.in/index.php/JSWC/article/view/127231. Acesso em: 3 jul. 2026.