@Book{Hegering.2008,
  author = {Hegering, Heinz-Gerd and Lehmann, Axel},
  title  = {Informatik 2008},

  year   = {2008},
  number = {},
  url    = {http://www.gbv.de/dms/ilmenau/toc/57789921X.PDF},

  const  = {\ text}
}