@article{Johnson2010,
  author    = {Alexander Johnson},
  title     = {Newton's use of the slit and lens in forming a pure spectrum : common error concerning this ; effectiveness of Newton's method in showing the dark lines on a screen},
  journal   = {Transactions of the Royal Society of Canada = M{\´e}moires de la Soci{\´e}t{\´e} Royale du Canada},
  volume    = {9},
  pages     = {49 -- 54},
  year      = {2010},
}