@Article{Harhoff.2003,
  author = {Dietmar Harhoff and Joachim Henkel and Eric Von Hippel},
  title  = {Profiting From Voluntary Information Spillovers: How Users Benefit by Freely Revealing Their Innovations},
  journal = {Research Policy},
  year   = {2003},
  number = {10},
  url    = {},

  const  = {\ text}
}