Co-utilization of CO2 and oil shale combustion wastes for production of PCC-type materialVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemik12th International Conference on Carbon Dioxide Utilization : ICCDU XII 2013 : June 23-27, 2013, Alexandria, VA, USA, Westin Hotel2013 / p. 230