Investigation of kukersite structure using NMR and oxidative cleavage : on the nature of phenolic precursors in the kerogen of Estonian kukersiteLille, Ülo; Heinmaa, I.; Müürisepp, Aleksander-Mati; Pehk, TõnisOil shale2002 / 2, p. 101-116 : ill https://www.researchgate.net/publication/288156758_Investigation_of_kukersite_structure_using_NMR_and_oxidative_cleavage_On_the_nature_of_phenolic_precursors_in_the_kerogen_of_Estonian_kukersite