Number | Name | Date | Kind |
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4646229 | Boyle | Feb 1987 | |
4914590 | Loatman et al. | Apr 1990 | |
4961139 | Hong et al. | Oct 1990 |
Entry |
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David A. Evans "Automatic Indexing Using Selective NLP And First-Order Thesauri" Oct. 30, 1990. |
Gerald Salton Automatic Text Processing, pp. i-xiii, 229-312 377-424, 1989. |
Lum, V., et al., "Designing DBMS Support for the Temporal Dimension," 1984 ACM, pp. 115-130. |