1. State Development Plan for Oil Shale Usage 2007-2015,2007
2. Development of ecologically acceptable technology for processing large particle kukersite in vertical retorts;Jefimov;Oil Shale,1997
3. Oil shale ash dumps waste water as polycyclic aromatic hydrocarbons and phenols pollution source;Trapido,1994
4. Application of shale ash in the building materials industry;Kikas,1968
5. Mineral matter of kukersite oil shale and its utilization;Kikas;Oil Shale,1988