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3. A.V. Aho, J.E. Hoperoft, J.D. Ullman, Data Structures and Algorithms, Addison-Wesley, Reading etc., 1983.
4. A. Aho, J.D. Ullman, Universality of data retrieval languages, Proc. 6th ACM Symposium on Principles of Programming Languages, 1979, pp. 110–120.
5. A.V. Aho, Y. Sagiv, J.D. Ullman, Equivalence among relational expressions, SIAM Journal on Computing 8 (1979), pp. 218–246.