K. RADHIKA, S. SIVAGNANAM, J. SEKAR, Y. MURALIDHARUDU, PRADIP DEY AND A. SUBBA RAO, R. Santhi, P. Stalin, K. Arulmozhiselva. Soil Fertility Appraisal for Villupuram District of Tamil Nadu using GPS and GIS Techniques. Journal of the Indian Society of Soil Science, India, v. 66, n. 2, 2018. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/83001. Acesso em: 6 jun. 2026.