Geodesic
An analitic approach in the theory of context-free languages Greibach normal form
Prikladnaâ diskretnaâ matematika, no. 3 (2009), pp. 112-116

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Context-free languages are consider as formal power series, which are solutions of the polynomial equations systems with noncommutative variables respectively multiplication. It is suggested to investigate these systems in Greibach normal form, that allows to research it more effectively. Commutative images of languages and defining systems are considered in complex domain. 
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     author = {O. I. Egorushkin and K. V. Safonov},
     title = {An analitic approach in the theory of context-free languages {Greibach} normal form},
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     url = {http://geodesic.mathdoc.fr/item/PDM_2009_3_a12/}
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O. I. Egorushkin; K. V. Safonov. An analitic approach in the theory of context-free languages Greibach normal form. Prikladnaâ diskretnaâ matematika, no. 3 (2009), pp. 112-116. http://geodesic.mathdoc.fr/item/PDM_2009_3_a12/