Операции над языками, генерируемыми -грамматиками
Viktor Alad'ev (1974)
Commentationes Mathematicae Universitatis Carolinae
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Viktor Alad'ev (1974)
Commentationes Mathematicae Universitatis Carolinae
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Josef Štefka (1971)
Kybernetika
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Д. Райков (1968)
Studia Mathematica
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M. N. L'vovskij (1975)
Commentationes Mathematicae Universitatis Carolinae
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