ISNUGROHO, K.; BIRAWIDHA, D. C. .; AMIN, M. The Potentials of Improving Mineral Source Additional Values in Lampung Province – A Prelimanary Study. Journal of Engineering and Scientific Research, [S. l.], v. 1, n. 1, p. 1–6, 2019. DOI: 10.23960/jesr.v1i1.2. Disponível em: https://jesr.eng.unila.ac.id/index.php/ojs/article/view/2. Acesso em: 26 jun. 2022.