USE OF X-RAY FLUORESCENCE SPECTROMETRY TO DETERMINE TRACE ELEMENTS IN GRAPHITE. Nigerian Journal of Technology, [S. l.], v. 14, n. 1, p. 1–4, 2003. DOI: 10.4314/njt.141.413. Disponível em: https://nijotech.com/index.php/nijotech/article/view/413. Acesso em: 16 apr. 2026.