δ13C chemostratigraphy of the Middle and Upper Ordovician sucession in the Tartu-453 drillcore, southern Estonia, and the significance of the HICEBauert, Heikki; Ainsaar, Leho; Põldsaar, Kairi; Sepp, SiimEstonian journal of earth sciences2014 / p. 195-200 : ill https://artiklid.elnet.ee/record=b2705791*est