Co-utilization of CO2 and waste oil shale ash to produce calcium carbonateVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemik11th International Conference on Carbon Dioxide Utilization (ICCDU XI), June 27-30, 2011, Dijon, France : programm & abstracts2011 / p. P133 : ill