Aqueous carbonation of oil shale wastes from Estonian power production for CO2 fixation and PCC productionUibu, Mai; Velts, Olga; Kuusik, Rein, keemikCYSENI 2011 : the 8th Annual International Conference of Young Scientist on Energy Issues, May 26-27, 2011, Kaunas, Lithuania : conference proceedings2011 / p. 415-424 : ill