@article{1379469,
      recid = {1379469},
      author = {Guidiri, Mouna, and Cadiat, Anne-Christine, and Lobeck,  Mareike,},
      title = {Freemium-Modell : "Gratis" als Verkaufsinstrument /},
      pages = {1 online resource (23 pages)},
      url = {http://library.usi.edu/record/1379469},
}