PANILAS, S.; HATZIYANNIS, G. The distribution of the trace element contents in lignite and ash from Drama lignite deposit, using multivariate statistical analysis. Bulletin of the Geological Society of Greece, [S. l.], v. 34, n. 3, p. 1255–1263, 2001. DOI: 10.12681/bgsg.17202. Disponível em: https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/17202. Acesso em: 5 may. 2024.