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grammar extensions

Extending a Natural Language Interface with Geospatial Queries

Chintaphally, V. R., K. Neumeier, J. McFarlane, J. Cothren, and C. W. Thompson, "Extending a Natural Language Interface with Geospatial Queries", Internet Computing, IEEE, vol. 11, issue 6, pp. 82 - 85, 2007///.