@Inproceedings{hoffmann2012pattern,
  author = {Hoffmann, A.},
  title  = {A pattern based approach for analysing requirements in socio-technical systems engineering},

  year   = {2012},
  number = {},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_400.pdf},

  const  = {\ text}
}
@Inproceedings{hoffmann2012patternbased,
  author = {Hoffmann, A.},
  title  = {A Pattern-Based Approach for Analysing Requirements in Socio-technical Systems Engineering},

  year   = {2012},
  number = {},
  url    = {},

  const  = {\ text}
}
@Inproceedings{hoffmann2012anforderungen,
  author = {Hoffmann, A. and Hoffmann, H. and Leimeister, J. M.},
  title  = {Anforderungen an Software Requirement Pattern in der Entwicklung sozio-technischer Systeme},

  year   = {2012},
  number = {},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_353.pdf},

  const  = {\ text}
}
@Inproceedings{ls_leimeister,
  author = {Hoffmann, A. and Söllner, M. and Hoffmann, H.},
  title  = {Twenty software requirement patterns to specify recommender systems that users will trust},

  year   = {2012},
  number = {},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_399.pdf},

  const  = {\ text}
}