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<p><b>Abstract</b>—In [<ref rid="bibk01895" type="bib">5</ref>], a family of relational database models (M-1 to M-5) were proposed to represent unknown values by intervals. Relational operators were extended for evaluating queries on these models. In this note, we stultify the theorems claiming that query evaluation in models M-2, M-3, and M-5 is sound.</p>
Incomplete information, disjunctive information, null values, extended relational model, extended relational algebra.

A. L. Chen and J. Chiu, "A Note on "Incomplete Relational Database Models Based on Intervals"," in IEEE Transactions on Knowledge & Data Engineering, vol. 8, no. , pp. 189-191, 1996.
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