Sulser, H.; Calzada, S. (1991). The genus Fortunella (Brachiopoda, Rhynchonellida) and its related species in the Upper Jurassic and Lower Cretaceous. Eclogae Geologicae Helvetiae. 84(3): 851-871.
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Sulser, H.; Calzada, S.
1991
The genus Fortunella (Brachiopoda, Rhynchonellida) and its related species in the Upper Jurassic and Lower Cretaceous