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References:
[1] Friš I.: Oral communication.
[2] Ginsburg S.: The mathematical theory of context-free languages. McGraw-Hill, New York 1966. MR 0211815 | Zbl 0184.28401
[3] Havel I.: Doctoral thesis. Prague 1967.
[4] Samoilenko L. G.: Doctoral thesis. Kiev 1968 (in Russian).
[5] Самойленко Л. Г.: Об одном классе. (1968) 2, 102-103. Zbl 1099.01025
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