1. Life Cycle Analysis of the Estonian Oil Shale Industry;Gavrilova,2005
2. National Development Plan for the Use of Oil Shale 2016–2030,2016
3. Eesti Põlevkivitööstuse Aastaraamat 2016;Beger,2017
4. Oecd Environmental Performance Reviews: Estonia 2016,2016
5. An Assessment of Oil Shale Technologies,1980