Popov, L. E.; Egerquist, E. V. A.; Zuykov, M. A. (2005). Ordovician (Arenig-Caradoc) syntrophiidine brachiopods from the east Baltic region. Palaeontology. 48(4): 739-761.
467245
Popov, L. E.; Egerquist, E. V. A.; Zuykov, M. A.
2005
Ordovician (Arenig-Caradoc) syntrophiidine brachiopods from the east Baltic region