Methylation of kukersite kerogen – estimation of the content of free hydroxyl groupsRõuk, Kristi; Kimm, Mariliis; Kaldas, Kristiina; Heinmaa, Ivo; Pehk, Tõnis; Silm, Estelle; Lopp, MargusOil shale2026 / p. 228-240 https://doi.org/10.3176/oil.2026.2.05 https://kirj.ee/oil-shale-publications/?v=a57b8491d1d8