Reference

Hans-Peter Schönlaub, Moses Attrep, K. Boeckelmann, Roland J.M.J. Dreesen, Raimund Feist, Alois Fenninger, Gerhard Hahn, diverse (1992): The Devonian/Carboniferous Boundary in the Carnic Alps (Austria) - A Multidisciplinary Approach – Jahrbuch der Geologischen Bundesanstalt – 135: 57 - 98.