Geochemical heterogeneity of Estonian graptolite argilliteVoolma, Margus; Soesoo, Alvar; Hade, Sigrid; Hints, Rutt; Kallaste, ToivoOil shale2013 / p. 377-401 : ill https://artiklid.elnet.ee/record=b2633538*est https://doi.org/10.3176/oil.2013.3.02 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS