Thermo-swelling behavior of Kukersite oil shale : commercial grade oil shale compared to its kerogenOja, Vahur; Yanchilin, Alexey; Kan, Tao; Strezov, VladimirJournal of thermal analysis and calorimetry2015 / p. 1163-1169 : ill http://dx.doi.org/10.1007/s10973-014-4258-5