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Riedel, F.; Healy, J. M.; Röpstorf, P.; Sitnikova, T. Ya. (2001). Ecology, Shell Morphology, Anatomy and Sperm Ultrastructure of the Caenogastropod Pyrgula annulata, with a Discussion of the Relationship between the 'Pyrgulidae' and Caspian and Baikalian Rissooideans. Limnologica. 31: 289-302.
Riedel, F.; Healy, J. M.; Röpstorf, P.; Sitnikova, T. Ya. (2001). Ecology, Shell Morphology, Anatomy and Sperm Ultrastructure of the Caenogastropod Pyrgula annulata, with a Discussion of the Relationship between the 'Pyrgulidae' and Caspian and Baikalian Rissooideans. Limnologica. 31: 289-302.
