@Incollection{noKey,
  author = {Atzmueller, Martin and Behrenbruch, Kay and Hoffmann, Axel and Kibanov, Mark and Macek, Bjoern-Elmar and Scholz, Christoph and Skistims, Hendrik and Söllner, Matthias and Stumme, Gerd},
  title  = {Connect-U: A System for Enhancing Social Networking},

  year   = {2014},
  number = {},
  url    = {http://dx.doi.org/10.1007/978-3-319-05044-7_15},
  doi = {10.1007/978-3-319-05044-7_15},
  const  = {\ text}
}
@Inbook{ABHKMSSSS:14,
  author = {Atzmueller, Martin and Behrenbruch, Kay and Hoffmann, Axel and Kibanov, Mark and Macek, Bjoern-Elmar and Scholz, Christoph and Skistims, Hendrik and Söllner, Matthias and Stumme, Gerd},
  title  = {Socio-technical Design of Ubiquitous Computing Systems},

  year   = {2014},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{schulz2013rechtliche,
  author = {Schulz, Thomas and Skistims, Hendrik and Zirfas, Julia and Atzmueller, Martin and Scholz, Christoph},
  title  = {Rechtliche Ausgestaltung sozialer Konferenzplattformen},
  journal = {ZD},
  year   = {2013},
  number = {},
  url    = {},

  const  = {\ text}
}