@BOOK{bell:cleary:witten,      
      AUTHOR = { T. C. Bell and J. G. Cleary and I. H. Witten},
      TITLE = {Text Compression},
      PUBLISHER = {Prentice-Hall, Englewood Cliffs, NJ},
      YEAR = {1990}
}

@ARTICLE{berry:dumais:obrien,
      AUTHOR = {M. W. Berry and S. T. Dumais and G. W. O'Brien},
      TITLE = {Using linear algebra for intelligent information retrieval},
      JOURNAL = {SIAM Review},
      VOLUME = {37},
      NUMBER = {4},
      PAGES = {573--595},
      YEAR = {1995}
}

@BOOK{duda:hart,
      AUTHOR = {Duda, R. O. and Hart, P. E.},
      TITLE = {Pattern Classification and Scene Analysis},
      PUBLISHER = {Wiley},
      YEAR = {1973} }

@BOOK{zipf,
      AUTHOR = { G. K. Zipf},
      TITLE = {Human Behavior and the Principle of Least Effort},
      PUBLISHER = {Addison Wesley, Reading, MA},
      YEAR = {1949}
}