@article{50162,
      author = {Sterzi, Valerio, and Maronero, Cecilia, and Orsatti,  Gianluca, and Vezzulli, Andrea,},
      url = {http://tind.wipo.int/record/50162},
      title = {Non-practicing entities in Europe: an empirical analysis  of patent acquisitions at the European Patent Office},
      recid = {50162},
      pages = {1 online resource (pp. 1271–1297)},
}