@Article{ls_leimeister,
  author = {Wegener, R. and Leimeister, J. M.},
  title  = {Virtual Learning Communities: Success Factors and Challenges},
  journal = {International Journal of Technology Enhanced Learning (IJTEL)},
  year   = {2012},
  number = {5/6},
  url    = {},

  const  = {\ text}
}