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Another view on functional and multivalued dependencies in the relational database model, and . International Journal of Computer and Information Sciences, 12 (4): 247--267 (1983)A solution to P11, , and . Bulletin of the European Association for Theoretical Computer Science, (1983)The Expressiveness of Query Languages for Nested Relations., and . IEEE Data Eng. Bull., 11 (3): 48-55 (1988)Closure properties of constraints., , and . J. ACM, 44 (4): 527-548 (1997)A unified theory of structural tractability for constraint satisfaction problems., , and . J. Comput. Syst. Sci., 74 (5): 721-743 (2008)On the Expressive Power of the Relational Algebra on Finite Sets of Relation Pairs., , , and . IEEE Trans. Knowl. Data Eng., 21 (6): 939-942 (2009)Comparing the expressiveness of downward fragments of the relation algebra with transitive closure on trees., , , , , , and . Inf. Syst., (2020)On matrices and K-relations., , and . Ann. Math. Artif. Intell., 90 (2-3): 181-210 (2022)A Unified Theory of Structural Tractability for Constraint Satisfaction and Spread Cut Decomposition., , and . IJCAI, page 72-77. Professional Book Center, (2005)Preface., and . Ann. Math. Artif. Intell., 83 (3-4): 209-212 (2018)