\newcommand{\noop}[1]{}\newcommand{\id}[1]{#1}
\begin{thebibliography}{10}

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J.F. Allen, B.W. Miller, E.K. Ringger, and T.~Sikorski.
\newblock A robust system for natural spoken dialogue.
\newblock In {\em 34th Annual Meeting of the Association for Computational
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\bibitem{AL92}
H.~Alshawi, editor.
\newblock {\em The Core Language Engine}.
\newblock MIT Press, 1992.

\bibitem{AU95}
H.~Aust, M.~Oerder, F.~Seide, and V.~Steinbiss.
\newblock The {P}hilips automatic train timetable information system.
\newblock {\em Speech Communication}, 17:249--262, 1995.

\bibitem{BO96}
M.~Boros et~al.
\newblock Towards understanding spontaneous speech: word accuracy vs.\ concept
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\newblock In {\em Proceedings of the Fourth International Conference on Spoken
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\bibitem{JA91}
E.~Jackson, D.~Appelt, J.~Bear, R.~Moore, and A.~Podlozny.
\newblock A template matcher for robust {NL} interpretation.
\newblock In {\em Speech and Natural Language Workshop}, pages 190--194,
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\bibitem{MO89a}
R.~Moore, F.~Pereira, and H.~Murveit.
\newblock Integrating speech and natural-language processing.
\newblock In {\em Speech and Natural Language Workshop}, pages 243--247,
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\bibitem{PE80}
F.C.N. Pereira and D.H.D. Warren.
\newblock Definite clause grammars for language analysis---a survey of the
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\newblock {\em Artificial Intelligence}, 13:231--278, 1980.

\bibitem{PO94}
C.~Pollard and I.A. Sag.
\newblock {\em Head-Driven Phrase Structure Grammar}.
\newblock University of Chicago Press, 1994.

\bibitem{vallduvi}
E.~Vallduvi.
\newblock {\em The Informational Component}.
\newblock PhD thesis, University of Pennsylvania, 1990.

\bibitem{NO97}
G.~van Noord.
\newblock An efficient implementation of the head-corner parser.
\newblock {\em Computational Linguistics}, 23, 1997.
\newblock To appear.

\bibitem{VE96}
G.~Veldhuijzen van Zanten.
\newblock Semantics of update expressions.
\newblock Document No.~24, NWO programme Language and Speech Technology, 1996.

\bibitem{WA89}
W.~Ward.
\newblock Understanding spontaneous speech.
\newblock In {\em Speech and Natural Language Workshop}, pages 137--141,
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