Frank Keller and 
   Mirella Lapata. Using the Web to Obtain Frequencies for Unseen Bigrams.  In  Computational Linguistics, Vol. 29(3):459-484,   2003.
 @Article{Keller_Lapata:2003,
        AUTHOR = {Keller, Frank and Lapata, Mirella},
        TITLE = {Using the Web to Obtain Frequencies for Unseen Bigrams},
        YEAR = {2003},
        JOURNAL = {Computational Linguistics},
        VOLUME = {29},
        NUMBER = {3},
        PAGES = {459-484} } 
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