Medunić, G., A. Rađenović, M. Bajramović, M. Švec, and M. Tomac. “Once Grand, Now Forgotten: What Do We Know about the Superhigh-Organic-Sulphur Raša Coal?”. Rudarsko-geološko-Naftni Zbornik, vol. 31, no. 3, Sept. 2016, pp. 27-45, doi:10.17794/rgn.2016.3.3.