Mitrović, D., Đoković, N., Životić, D., Bechtel, A., Cvetković, O., & Stojanović, K. (2017). Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) – Implications from petrographic, biomarker and isotopic analysis. Journal of the Serbian Chemical Society, 82(6), 739–754. https://doi.org/10.2298/JSC161122030M