RAMAKRISHNA, CH.; MALLIKARJUNA RAO, D. Geochemical Exploration and Processing Studies for Graphite and Tungsten Minerals from Burugubanda-Tapaskonda Areas of East Godavari District. Asian Journal of Chemistry, [S. l.], v. 22, n. 6, p. 4585–4590, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/16767. Acesso em: 7 jul. 2024.