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A method for proving programming languages non context-free. (English) Zbl 0384.68071

MSC:
68Q45 Formal languages and automata
Software:
ALGOL 60
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References:
[1] Blikle, A., Wybrane zegadnienia lingwistyki matematycznej, (), 94-152, (in Polish)
[2] Floyd, R.W., On the nonexistence of a phrase structure grammer for ALGOL 60, Comm. ACM, 5, 483-484, (1962) · Zbl 0112.35805
[3] Naur, P., Revised report on the algorithmic language ALGOL 60, Numerische Mathematik, 4, 420-453, (1963) · Zbl 0109.35105
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