	Authors	Year	Title
	Korn	1988c	On the stratigraphical occurence of Cymaclymenia evoluta (H.Schmidt 1914) at the type locality. Courier Forschungsinstitut Senckenberg, 100: 215-216, fig.1; Frankfurt a.M.
	Korn	1993	The ammonoid faunal change near the Devonian-Carboniferous boundary. Annales de la Societé géologique de Belgique, 115 (2): 581-593, fig.1-13; Bruxelles.