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Dietze, Volker and Schweigert, Günter and Dietl, Gerd and Auer, Wolfgang and Dangelmaier, Wolfgang and Furze, Roger and Gräbenstein, Stefan and Kutz, Michael and Neisser, Elmar and Schneider, Erich and Schreiber, Dietmar (2010): Rare Middle Jurassic ammonites of the families Erycitidae, Otoitidae and Stephanoceratidae from southern Germany. In: Zitteliana, Vol. A 50: pp. 71-88