@book{zipf32selective,
  author = {Zipf, G. K.},
  interhash = {3c608b74ec727229ac166703d763d336},
  intrahash = {09292a36e242c63a5327905d4a8779b1},
  publisher = {Harvard University Press},
  title = {Selective Studies and the Principle of Relative
                  Frequency in Language},
  year = 1932
}