Popov, L. E.; Pour, M. G.; Bassett, M. G.; Kebria-ee, M. (2009). Billengsellide and orthide brachiopods: new insights into earliest Ordovician evolution and biogeography from northern Iran. Palaeontology. 52(1): 35-52.
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Popov, L. E.; Pour, M. G.; Bassett, M. G.; Kebria-ee, M.
2009
Billengsellide and orthide brachiopods: new insights into earliest Ordovician evolution and biogeography from northern Iran