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- Jensen, Sören; =Mens, Kaisa (2001). "Trace fossils Didymaulichnus cf. tirasensis and Monomorphichnus isp. from the Estonian Lower Cambrian, with a discussion on the Early Cambrian ichnocoenoses of Baltica" (PDF). Proc. Estonian Acad. Sci. Geol. 50 (2): 75–85.
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