Age constraints of the Hungshihyen Formation (Early to Middle Ordovician) on the western margin of the Yangtze Platform, South China : new insights from chitinozoansLiang, Yan; Wang, Guang-Xu; Servais, Thomas; Wu, Rong-Chang; Nõlvak, Jaak; Hints, Olle; Weif, Xin; Gong, Fang-YiPalaeoworld2020 / p. 66-74 : ill https://doi.org/10.1016/j.palwor.2019.05.008 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS High-resolution trilobite stratigraphy of the Lower–Middle Ordovician Öland Series of BaltoscandiaPärnaste, Helje; Bergström, Jan; Zhiyi, ZhouGeological magazine2012 / p. 1-10 : ill https://pubs.geoscienceworld.org/geolmag/article-abstract/150/3/509/299539/High-resolution-trilobite-stratigraphy-of-the On the lower boundary of the Floian Stage in EstoniaPärnaste, Helje; Viira, ViiveEstonian journal of earth sciences2012 / p. 205-209 https://artiklid.elnet.ee/record=b2551998*est