• Fast assessment of oil shale quality by spectral methods = Põlevkivi kvaliteedi kiirmääramine spektraalsetel meetoditelTufail, Iram2022 https://doi.org/10.23658/taltech.50/2022 https://digikogu.taltech.ee/et/Item/23cf4874-d577-47fe-8dd0-8cf21a75cb0b https://www.ester.ee/record=b5511738*est