Geochemistry of sulfur in coal Geochemistry of sulfur in fossil fuels, Am. Chem. Soc, pp.30-52, 1990. ,
Geochemistry of germanium in Bulgarian coal; Fuel and Energy Abst, p.170, 1996. ,
Paleogene magmatism in the Central Rhodopes area, Bulgaria ? A review and new data, Acta Vulcanologica, vol.10, pp.199-216, 1998. ,
Study of physical and chemical properties of vitrinites. Inferences on depositional and coalification controls, Chemical Geology, vol.150, issue.3-4, pp.197-221, 1998. ,
DOI : 10.1016/S0009-2541(98)00048-5
Secondary quartzites from the Northeastern periphery of the Borovitsa volcanic area: I. Geological-petrographic characteristics of the hydrothermally altered zones, Geochem. Mineral. Petrol, vol.28, pp.46-72, 1991. ,
Constraints of stable isotopes on the origin of alunite from advanced argillic alteration systems in Bulgaria, Journal of Geochemical Exploration, vol.90, issue.3, pp.166-182, 2006. ,
DOI : 10.1016/j.gexplo.2005.11.001
TEMPORAL EVOLUTION OF ARC MAGMATISM AND HYDROTHERMAL ACTIVITY, INCLUDING EPITHERMAL GOLD VEINS, BOROVITSA CALDERA, SOUTHERN BULGARIA, Economic Geology, vol.95, issue.5, pp.1155-1164, 2000. ,
DOI : 10.2113/gsecongeo.95.5.1155