• Carl Pollard and Ivan A. Sag. 1994. Head-Driven Phrase Structure Grammar. Chicago and Stanford: U. Chicago Press and CSLI Publications. Pages 1--46 and pages 55--59. (.pdf file).

Further Readings:

• Wikipedia entry for HPSG.
• Ivan Sag. 2004. The Historical Background of HPSG. Part of the 2004 L221a website.
• Ananda Lima. ND (2002+). Introduction to Head-Driven Phrase Structure Grammar. Published on-line: University of Queensland.
• Gert Webelhuth, Jean-Pierre Koenig, and Andreas Kathol. 1999. HPSG as a Theory of Grammar (.pdf file). Introduction to Lexical and Constructional Aspects of Linguistic Explanation Stanford: CSLI Publications. Pages 1--11.
• Carl Pollard. 1996. The Nature of Constraint-Based Grammar ( text file). Talk presented at Kyung Hee University, Seoul. Unpublished manuscript: Ohio State University.

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