On multiple grammars
Kybernetika, Tome 05 (1969) no. 1, p. 85.

Voir la notice de l'article dans Czech Digital Mathematics Library

Classification : 94.50 
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     author = {Kr\'al, Jaroslav},
     title = {On multiple grammars},
     journal = {Kybernetika},
     pages = {--85},
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     volume = {05},
     number = {1},
     year = {1969},
     mrnumber = {0250802},
     zbl = {0175.27703},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/KYB_1969__5_1_a4/}
}
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Král, Jaroslav. On multiple grammars. Kybernetika, Tome 05 (1969) no. 1, p. 85. https://geodesic-test.mathdoc.fr/item/KYB_1969__5_1_a4/