@Incollection{baumgartner2009hermann,
  author = {Baumgärtner, Ingrid},
  title  = {Hermann II. der Gelehrte},

  year   = {2009},
  number = {},
  url    = {http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:de:hebis:34-2012011240301},

  const  = {\ text}
}