A characterization of poly-slender context-free languages

@article{Ilie2000ACO,
  title={A characterization of poly-slender context-free languages},
  author={Lucian Ilie and Grzegorz Rozenberg and Arto Salomaa},
  journal={RAIRO Theor. Informatics Appl.},
  year={2000},
  volume={34},
  pages={77-86}
}
For a non-negative integer k , we say that a language L is k -poly-slender if the number of words of length n in L is of order ${\cal O}(n^k)$ . We give a precise characterization of the k -poly-slender context-free languages. The well-known characterization of the k -poly-slender regular languages is an immediate consequence of ours. 
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