Decarbonisation of Estonian oil shale industry : framework and categories definitionEldermann, Meelis; Siirde, Andres; Gušča, JulijaEnergy procedia2017 / p. 77-81 : ill https://doi.org/10.1016/j.egypro.2017.04.020 Conference proceedings at Scopus Article at Scopus Article at WOS