@article{PDM_2010_12_a40,
     author = {K. V. Safonov and D. A. Kalugin-Balashov},
     title = {On representation of context-free languages by diagonals of linear laguages},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {82--83},
     publisher = {mathdoc},
     number = {12},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2010_12_a40/}
}