The composition and properties of ash in the context of the modernisation of oil shale industryUibu, Mai; Tamm, Kadriann; Viires, Regiina; Reinik, Janek; Somelar, Peeter; Raado, Lembi-Merike; Hain, Tiina; Kuusik, Rein, keemik; Trikkel, AndresOil shale2021 / p. 155–176 : ill https://doi.org/10.3176/oil.2021.2.04 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS