Experimental analysis of the combustion characteristics of Estonian oil shale in air and oxy-fuel atmospheresLoo, Lauri; Maaten, Birgit; Siirde, Andres; Pihu, Tõnu; Konist, AlarFuel processing technology2015 / p. 317-324 : illhttp://dx.doi.org/10.1016/j.fuproc.2014.12.051