MARKOVA, Kalinka; FILCHEVA, Ekaterina; STEFANOVA, Maia; MILAKOVSKA, Zlatka; MARINOV, Stefan. Composition of Organic Matter in Dump Materials from East Maritsa Coal Basin (Bulgaria). Bulgarian Journal of Soil Science, Agrochemistry and Ecology, Sofia, BG, v. 45, n. Supplement 1-4, p. 35–39, 2011. Disponível em: https://agriacad.eu/ojs/index.php/bjssae/article/view/4085.. Acesso em: 9 oct. 2026.