APOSTOLOVA, D.; STOJANOVIĆ, K.; KOSTOVA, I.; SACHSENHOFER, R.; BOTOUCHAROV, N. Organic Geochemistry and Biomarker Characterization of Eocene Coal from the Burgas Basin. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 79, n. 8, p. 1055–1065, 2026. DOI: 10.7546/CRABS.2026.08.06. Disponível em: https://www.proceedings.bas.bg/index.php/cr/article/view/1030. Acesso em: 4 sep. 2026.