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Ullman, J. D.
Magic sets and other strange ways to implement logic programs
Bancilhon, F. | Maier, D. | Sagiv, Y. | Ullman, J. D.
In PODS-86, pp. 1–16
Implementation of logical query languages for databases
Ullman, J. D.
ACM Transactions on Database Systems, 10 (3), 289-321.
Formal languages and their relation to automata
Hopcroft, J. E., Ullman, J. D.
Reading, Mass.: Addison-Wesley.