1. Ordovician (Arenigian) Acritarchs from the Solanas Sandstone Formation, Central Sardinia, Italy;Albani;Bol. Soc. Paleontol. Ital.,1989
2. Acritarchs and Conodonts from the Cambro-Ordovician Furuhäll (Köpingsklint) section (Öland, Sweden);Bagnoli;Riv. Ital. Paleontol. Stratigr.,1988
3. Middle Ordovician acritarchs from the island of Odinsholm, Estonia;Bockelie;Geol. Fören. Stockholm Förh.,1979
4. The Asaphus Limestone in Northernmost Öland;Bolhin;Bull. Geol. Inst. Uppsala,1949
5. Weitere organische Mikrofossilien aus dem unteren Ordovizium;Burmann;Paläontol. Abh. B,1970