@Incollection{steenweg1994using,
  author = {Steenweg, Helge},
  title  = {Using a computer to analyse the social structure and social topography of a mediaeval town},

  year   = {1994},
  number = {},
  url    = {},

  const  = {\ text}
}
@Incollection{steenweg1992computers,
  author = {Steenweg, Helge},
  title  = {Computers and Social History: Building a Database from Mediaeval Tax Registers for improved Information  Retrieval in Göttingen},

  year   = {1992},
  number = {},
  url    = {},

  const  = {\ text}
}