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"The Dot-Depth Hierarchy of Star-Free Languages is Infinite."
Janusz A. Brzozowski, Robert Knast (1978)
- Janusz A. Brzozowski, Robert Knast:
The Dot-Depth Hierarchy of Star-Free Languages is Infinite. J. Comput. Syst. Sci. 16(1): 37-55 (1978)
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