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"Provability, complexity, grammars."
Lev D. Beklemishev, Mati Pentus, Nikolai K. Vereshchagin (1999)
- Lev D. Beklemishev, Mati Pentus, Nikolai K. Vereshchagin:
Provability, complexity, grammars. American Mathematical Society translations series 2 192, American Mathematical Society 1999, ISBN 978-0-8218-1078-1, pp. I-VIII, 1-172
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