Amler, M. R. W. (2004). Late Famennian bivalve, gastropod and bellerophontid molluscs from the Refrath 1 Borehole (Bergisch Gladbach-Paffrath Syncline; Ardennes-Rhenish Massif, Germany). Courier Forschungsinstitut Senckenberg. 251: 151-173.
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Amler, M. R. W.
2004
Late Famennian bivalve, gastropod and bellerophontid molluscs from the Refrath 1 Borehole (Bergisch Gladbach-Paffrath Syncline; Ardennes-Rhenish Massif, Germany)