@article{KrampeEricsson1995,
  author    = {Krampe, Ralf-Thomas and Ericsson, Anders K.},
  title     = {Deliberate practice and elite musical performance},
  year      = {1995},
  language  = {en}
}
@article{KrampeEricsson1996,
  author    = {Krampe, Ralf-Thomas and Ericsson, Anders K.},
  title     = {Mainting excellence : deliberate practice and elite performance in young and old pianists},
  year      = {1996},
  language  = {en}
}