@article{PDM_2008_2_a1,
     author = {O. I. Yegorushkin and D. A. Kalugin-Balashov and K. V. Safonov},
     title = {On a solving of algebraic equations systems associated with context-free languages},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {8--11},
     publisher = {mathdoc},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2008_2_a1/}
}