@article{ITA_1990__24_3_275_0,
     author = {Pierre, Laurent and Farinone, Jean-Marc},
     title = {Context-free languages with rational index in $\Theta (n^\gamma )$ for algebraic numbers $\gamma $},
     journal = {RAIRO. Informatique th\'eorique et applications},
     pages = {275--322},
     year = {1990},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {3},
     mrnumber = {1072995},
     zbl = {0701.68068},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1990__24_3_275_0/}
}