@incollection{,
address  = {},
author = {Crossgrove, William C.},
booktitle = {Verfasserlexikon},
keywords = {Butzbach; Butzbach, Konrad von (1425c)},
pages = {Sp. 876},
title={Art. Konrad von Butzbach},
uniqueid = {1390908},
url = {http://opac.regesta-imperii.de/id/1390908},
year = {2004}
}