Submitted on: 10 June 2003.
Revised on: 03 July 2003.
Accepted on: 29 July 2003.
Transactions of the Association for Computational Linguistics
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Submitted on: 03 February 2010.
Revised on: 07 March 2010.
Accepted on: 29 March 2010.
Transactions of the Association for Computational Linguistics
Submitted on: 28 March 2003.
Revised on: 26 April 2003.
Accepted on: 19 May 2003.
Transactions of the Association for Computational Linguistics