• Comparison of the porous structure of oil shale fly ashes from two different CFB boilersPikkor, Heliis18th International Symposium "Topical Problems in the Field of Electrical and Power Engineering". Doctoral School of Energy and Geotechnology III : Toila, Estonia, January 14-19, 2019 : [proceedings]2019 / p. 99-100 : ill https://www.ester.ee/record=b5183874*est