• Geochemistry and correlation of volcanic ash beds from the Rootsiküla Stage (Wenlock-Ludlow) in the eastern BalticKiipli, Tarmo; Einasto, Rein; Kallaste, Toivo; Nestor, Viiu-Kai; Perens, Helle; Siir, SvenEstonian journal of earth sciences2011 / 4, p. 207-219 : ill https://artiklid.elnet.ee/record=b2455468*est