Estonian graptolite argillites revisited : a future resource?Hade, Sigrid; Soesoo, AlvarOil shale2014 / p. 4-18 : ill https://artiklid.elnet.ee/record=b2664044*est https://doi.org/10.3176/oil.2014.1.02 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS