An extension for the concept of finite index of a context-free grammar
Annales Fennici Mathematici, 501-520 (1972).

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@article{AFM_1972_501-520_a2,
     author = {Timo Lepist\"o},
     title = {An extension for the concept of finite index of a context-free grammar},
     journal = {Annales Fennici Mathematici},
     publisher = {mathdoc},
     volume = {501-520},
     year = {1972},
     doi = {10.5186/aasfm.1972.518},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1972.518/}
}
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Timo Lepistö. An extension for the concept of finite index of a context-free grammar. Annales Fennici Mathematici, 501-520 (1972). doi : 10.5186/aasfm.1972.518. http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1972.518/

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