Centimetre-scale variability of redox-sensitive elements in Tremadocian black shales from the eastern Baltic PalaeobasinHints, Rutt; Soesoo, Alvar; Voolma, Margus; Tarros, Siim; Kallaste, Toivo; Hade, SigridEstonian journal of earth sciences2014 / p. 233-239 : ill https://artiklid.elnet.ee/record=b2705856*est