Number | Name | Date | Kind |
---|---|---|---|
5222235 | Hintz et al. | Jun 1993 | |
5265244 | Ghosh et al. | Nov 1993 | |
5446575 | Lysakowski, Jr. | Aug 1995 | |
5530964 | Alpert et al. | Jun 1996 | |
5692171 | Andres | Nov 1997 | |
5758357 | Barry et al. | May 1998 |
Entry |
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C.J. Date, An Introduction to Database systems , 6th Ed., 1995 p. 769.770. |