@Inproceedings{hirdes2012towards,
  author = {Hirdes, E. M. and Thillainathan, N. and Leimeister, J. M.},
  title  = {Towards Modeling Educational Objectives in Serious Games},

  year   = {2012},
  number = {},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_355.pdf},

  const  = {\ text}
}