@misc{Kranich2007,
  author    = {Jan Kranich},
  title     = {Too much R\&D? - Vertical differntiation in a model of monopolistic competition},
  institution = {Fr{\"u}here Fachbereiche},
  series    = {University of L{\"u}neburg Working paper series in economics},
  number    = {59},
  type      = {researchpaper},
  year        = {2007},
}