Lower to middle Ordovician trilobite faunas along the Ural border of BalticaPärnaste, Helje; Bergström, JanBulletin of Geosciences2014 / p. 431 - 450 https://doi.org/10.3140/bull.geosci.1448 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Trilobites and biofacies in the Early-Middle Ordovician of Baltica and a brief comparison with the Yangtze PlateBergström, Jan; Pärnaste, Helje; Zhiyi, ZhouEstonian journal of earth sciences2013 / p. 205-230 : ill https://artiklid.elnet.ee/record=b2651566*est https://doi.org/10.3176/earth.2013.16 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS