@Inproceedings{ls_leimeister,
  author = {Riedl, C. and Wagner, S. and Leimeister, J. M. and Krcmar, H.},
  title  = {Exploring Large Collections of Ideas in Collaborative Settings through Visualization},

  year   = {2010},
  number = {20},
  url    = {http://www.uni-kassel.de/fb7/ibwl/leimeister/pub/JML_205.pdf},

  const  = {\ text}
}
@Inproceedings{ls_leimeister,
  author = {Riedl, C. and Wagner, S. and Leimeister, J. M. and Krcmar, H.},
  title  = {Exploring Large Collections of Ideas in Collaborative Settings through Visualization},

  year   = {2010},
  number = {20},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_196.pdf},

  const  = {\ text}
}