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| 1991 | ||
|---|---|---|
| 2 | G. H. Gessert: Handling Missing Data by Using Stored Truth Values. SIGMOD Record 20(3): 30-42 (1991) | |
| 1990 | ||
| 1 | G. H. Gessert: Four Valued Logic for Relational Database Systems. SIGMOD Record 19(1): 29-35 (1990) | |
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