Calcium extraction from Estonian industrial wastes based on ammonium solventsTamm, Kadriann; Viires, Regiina; Kuusik, Rein, keemik; Uibu, MaiEnergy and sustainability VII2018 / p. 465-476 : ill http://dx.doi.org/10.2495/ESUS170431

Crystallization of calcium carbonate on the basis of oil shale waste ash in a continuous flow disintegrator-reactorVelts, Olga; Kindsigo, Merit; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikISIC 19 : 19th International Symposium on Industrial Crystallization : book of abstracts : 16-19 September 2014, Toulouse - France2014 / p. 359-360 : ill

Modelling continuous process for precipitated calcium carbonate production from oil shale ashTamm, Kadriann; Kallas, Juha; Kuusik, Rein, keemik; Uibu, MaiEnergy procedia2017 / p. 5409-5416 : ill https://doi.org/10.1016/j.egypro.2017.03.1685

Waste oil shale ash as a novel source of calcium for precipitated calcium carbonate : carbonation mechanism, modeling, and product characterizationVelts, Olga; Uibu, Mai; Kallas, Juha; Kuusik, Rein, keemikJournal of hazardous materials2011 / p. 139-146 : ill