Chapter
Fundamentals of Computation Theory, 1989, Volume 380
ISBN : 978-3-540-51498-5
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Series: Lecture Notes in Computer Science, Year: 2018, Volume 10944, Page 163
DOI: 10.1007/978-3-662-57669-4_9
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Journal: Bulletin of Symbolic Logic, 1997, Volume 3, Number 1, Page 53
DOI: 10.2307/421196
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