Activation and reactivity of Estonian oil shale cyclone ash towards SO2 bindingKaljuvee, Tiit; Trass, Olev; Pihu, Tõnu; Konist, Alar; Kuusik, Rein, keemikJournal of thermal analysis and calorimetry2015 / p. 19-28 : ill http://dx.doi.org/10.1007/s10973-014-4308-z

Oil shale pulverized firing : boiler efficiency, ash balance and flue gas compositionKonist, Alar; Pihu, Tõnu; Nešumajev, Dmitri; Siirde, AndresOil shale2013 / p. 6-18 : ill https://artiklid.elnet.ee/record=b2604229*est