@incollection{,
address  = {},
author = {Irgang, Winfried},
booktitle = {Irgang, Schlesien im Mittelalter},
keywords = {Mittelalter; Irgang, Winfried (1942-)},
pages = {289-301},
title={Urkundenforschung},
uniqueid = {1301233},
url = {http://opac.regesta-imperii.de/id/1301233},
year = {2007}
}