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Gubanov A.P., Peel J.S. (2001). Latest helcionelloid molluscs from the Lower Ordovician of Kazakhstan. Palaeontology. 44(4): 682-692.
Gubanov A.P., Peel J.S. (2001). Latest helcionelloid molluscs from the Lower Ordovician of Kazakhstan. Palaeontology. 44(4): 682-692.