Frýda, J. (2000). Some new Givetian (late Middle Devonian) gastropods from the Paffrath area (Bergisches Land, Germany). Memoirs of the Oueensland Museum. 45(2): 359-374. Brisbane.
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Frýda, J.
2000
Some new Givetian (late Middle Devonian) gastropods from the Paffrath area (Bergisches Land, Germany)