1. Molecular model of Estonian kukersite kerogen evaluated by 13C MAS NMR spectra☆
2. Characterization of tars from Estonian Kukersite oil shale based on their volatility
3. H.W. Klewer, K. Mauch, Über den estländischen Ölschiefer “Kukersit” Halle, 1927.
4. Y.I. Hisin, Thermal Decomposition of Oil Shales, Leningrad, Moscow, GOSTOPIZDAT, 1948 (in Russian).
5. P. Krumin, Review of the Estonian oil shale industry, with brief account of oil shale developments in the United States, Engineering Experiment Station, Circular No 50 in Ohio State University Studies, Eng. Series 18, 1949, 126 pp.