Apostolova, D., Stojanović, K., Kostova, I., Sachsenhofer, R. and Botoucharov, N. 2026. Organic Geochemistry and Biomarker Characterization of Eocene Coal from the Burgas Basin. Proceedings of the Bulgarian Academy of Sciences. 79, 8 (Aug. 2026), 1055–1065. DOI:https://doi.org/10.7546/CRABS.2026.08.06.