• Composition of oil shale ashes from pulverized firing and circulating fluidized-bed boiler in Narva Thermal Power PlantsBitjukova, Liidia; Mõtlep, Riho; Kirsimäe, KalleOil shale2010 / 4, p. 339-353 : ill https://artiklid.elnet.ee/record=b2185248*est