Ewers, H. (1995).  [Fishladder at the lower Wupper River]. Wasser und Boden.  
47:50.
	
The restoration of free fish passage along a river regulated with barrages is 
essential for the interactive environment of wild life. Fishladders will have to 
be installed, because the barrages are inevitable. Several types of fishladders 
constructed by the Wupperverband along the lower Wupper are introduced.