1. Acritarchs and conodonts from the Cambro-Ordovician Furuhäll (Köpingsklint) section (Öland, Sweden);Bagnoli;Riv. Ital. Paleontol. Stratigr.,1988
2. Middle Ordovician acritarchs from the island of Odinsholm, Estonia;Bockelie;Geologiska Fören. Stockholm Förh.,1979
3. The Asaphus Limestone in Northernmost Öland;Bohlin;Bull. Geol.Inst. Uppsala,1949
4. Diacrodien aus dem uteren Ordovizium;Burmann;Paläontol. Abh.,1968
5. Thymadora, a new acritarch genus from the Middle Cambrian Rogersville shale of Tennessee, U.S.A.;Clendening;Palynology,1981