@article{3069,
  author       = {{Gries, Thomas and Wigger, B.}},
  journal      = {{Economia Internationale}},
  number       = {{4}},
  pages        = {{3--13}},
  title        = {{{The Dynamics of Upgrading or how to catch-up}}},
  volume       = {{46}},
  year         = {{1993}},
}