@article{hall1954learning,
  author = {Hall, J.F.},
  interhash = {7a093903087cbef830e4cb488bdb3a53},
  intrahash = {6675727373a7ddc1bff48b48175d96f7},
  issn = {0002-9556},
  journal = {The American Journal of Psychology},
  number = 1,
  pages = {138--140},
  publisher = {JSTOR},
  title = {{Learning as a function of word-frequency}},
  url = {http://scholar.google.de/scholar.bib?q=info:R5OP8KAzPowJ:scholar.google.com/&output=citation&hl=de&as_sdt=2000&ct=citation&cd=28},
  volume = 67,
  year = 1954
}

@article{breland1996word,
  author = {Breland, H.M.},
  interhash = {82b0d54e87ffff15864f7495964fa165},
  intrahash = {3c317828e740d8366d8c5762ebbdccd8},
  issn = {1467-9280},
  journal = {Psychological Science},
  number = 2,
  pages = {96--99},
  publisher = {John Wiley \& Sons},
  title = {{WORD FREQUENCY AND WORD DIFFICULTY}},
  url = {http://scholar.google.de/scholar.bib?q=info:wgQfeigm3EgJ:scholar.google.com/&output=citation&hl=de&as_sdt=2000&ct=citation&cd=0},
  volume = 7,
  year = 1996
}