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Isolable and weakly isolable sets. (English) Zbl 0143.25604


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[1] D. G. Cantor: On the Ambiguity Problem of Backus Systems. J. Assoc. Comp. Mach. 9, 1962, 477-479. · Zbl 0114.33003 · doi:10.1145/321138.321145
[2] Václav Fabian: Structural unambiguity of formal languages. Czechoslovak Math. J. 14 (89), (1964), 394-430. · Zbl 0278.68062
[3] K. W. Floyd: On ambiguity in Phrase Structure Language. Comm. ACM 1962, 527-529.
[4] Jozef Gruska: Induction in formal Languages. Some Properties of Reducing. Transformations and of Isolable Sets. Czechoslovak Math. J. 15 (90), 1965, 406-415. · Zbl 0135.25201
[5] Jozef Gruska: Structural unambiguity of ALGOL MOD. Comm. Math. Univ. Carol. V. 6, 1965, 281-328. · Zbl 0139.00802
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