@article{diederich2002-12164720,
  author  = {Diederich, N. J. and Raman, R. and Leurgans, S. and Goetz, C. G.},
  title   = {{Progressive worsening of spatial and chromatic processing deficits in Parkinson disease}},
  journal = {Archives of neurology},
  year    = {2002},
  doi     = {10.1001/archneur.59.8.1249},
  pmid    = {12164720},
  url     = {https://doi.org/10.1001/archneur.59.8.1249}
}