no. 3
Context-free languages with rational index in Θ(n γ ) for algebraic numbers γ
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 3, pp. 275-322. 
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     author = {Pierre, Laurent and Farinone, Jean-Marc},
     title = {Context-free languages with rational index in $\Theta (n^\gamma )$ for algebraic numbers $\gamma $},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {275--322},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {3},
     year = {1990},
     mrnumber = {1072995},
     zbl = {0701.68068},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1990__24_3_275_0/}
}
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Pierre, Laurent; Farinone, Jean-Marc. Context-free languages with rational index in $\Theta (n^\gamma )$ for algebraic numbers $\gamma $. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 3, pp. 275-322. http://www.numdam.org/item/ITA_1990__24_3_275_0/

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