1. Ots A. Oil shale fuel combustion. Tallinna Raamatutrükikoda. Tallinn: 2006. [ISBN 9949-13-710-1].
2. Aspects concidered in new CFB boiler design for Narva Power Plants;Kinnunen;Oil Shale,2003
3. Experience of Estonian oil shale combustion based on CFB technology at Narva Power Plants;Hotta;Oil Shale,2005
4. Cement chemistry;Taylor,1997
5. Characterization of oil shale ashes formed at industrial-scale CFBC boilers;Kuusik;Oil Shale,2005