- Jaffe, Jeffrey, A Necessary and Sufficient Pumping Lemma for Regular Languages, ACM SIGACT News, Vol. 10, No. 2, Summer 1978, pp. 48--49. Google ScholarDigital Library
- Rabin, M. O., and D. Scott, Finite Automata and Their Decision Problems, IBM Journal of Research and Development, Vol. 3, No. 2, April 1959, pp. 114--125. Reprinted in Sequential Machines: Selected Papers, B. F. Moore, ed., Addison-Wesley, 1964.Google ScholarDigital Library
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- A pumping theorem for regular languages
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