Nerinea-Fantini Sestini & Martin Glaus (1966) Milano- Brachiopods from the Upper Permian Nessen.
Formation (North Iran)-V.72-n.4.
Raymond C. Moore (1965) Treatise on invertebrate Paleontology vol.1,2.- The University of Kansas Press.
Ruzhensev V.E. & Sarycheva T.G., 1969; The Development and charge of marine organisms at Paleozoic-Mesozoic boundary Moscow University.
