First record of the trace fossil Oikobesalon from the Ordovician (Darriwilian) of BalticaVinn, Olev; Toom, UrsulaEstonian journal of earth sciences2014 / p. 118-121 : ill https://artiklid.elnet.ee/record=b2673778*est

Ordovician reef and mound evolution: the Baltoscandian pictureKröger, Björn; Hints, Linda; Lehnert, OliverGeological magazine2017 / p. 683-706 : ill https://doi.org/10.1017/S0016756816000303