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Repetitions and permutations of columns in the semijoin algebra., and . ITA, 43 (2): 179-187 (2009)Similarity and bisimilarity notions appropriate for characterizing indistinguishability in fragments of the calculus of relations., , , , , and . J. Log. Comput., 25 (3): 549-580 (2015)On the expressive power of semijoin queries., , and . Inf. Process. Lett., 91 (2): 93-98 (2004)On the complexity of division and set joins in the relational algebra., and . J. Comput. Syst. Sci., 73 (4): 538-549 (2007)On the complexity of division and set joins in the relational algebra., and . PODS, page 76-83. ACM, (2005)The semijoin algebra and the guarded fragment, , and . CoRR, (2004)Relative expressive power of navigational querying on graphs., , , , , , , and . Inf. Sci., (2015)The impact of transitive closure on the expressiveness of navigational query languages on unlabeled graphs., , , , , , and . Ann. Math. Artif. Intell., 73 (1-2): 167-203 (2015)Metadata Quality Evaluation of a Repository Based on a Sample Technique., and . MTSR, volume 343 of Communications in Computer and Information Science, page 181-189. Springer, (2012)Relative Expressive Power of Navigational Querying on Graphs., , , , , , , and . CoRR, (2014)