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"On the Computational Power of Pushdown Automata."
Alfred V. Aho, Jeffrey D. Ullman, John E. Hopcroft (1970)
- Alfred V. Aho, Jeffrey D. Ullman, John E. Hopcroft:
On the Computational Power of Pushdown Automata. J. Comput. Syst. Sci. 4(2): 129-136 (1970)
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