Eisenack, 1958b
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Eisenack, A., 1958b: Mikrofossilien aus dem Ordovizium des Baltikums. 1. Markasitschicht, Dictyonema-Schiefer, Glaukonitsand, Glaukonitkalk. Senckenbergiana Lethaea, v.39, no.5-6, p.389-405, pl.1-2.