@incollection{, address = {}, author = {Mertens, Volker}, booktitle = {Verfasserlexikon}, keywords = {Leuthold <von Seven> (13. Jh.); Mertens, Volker (1937-)}, pages = {Sp. 735-738}, title={Art. Leuthold von Seven}, uniqueid = {1398744}, url = {http://opac.regesta-imperii.de/id/1398744}, year = {1985} }