@article{ITVS_2009_4_a2,
     author = {M. S. Sobolev},
     title = {The {X-Machine} description of a system},
     journal = {Informacionnye tehnologii i vy\v{c}islitelnye sistemy},
     pages = {22--27},
     publisher = {mathdoc},
     number = {4},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ITVS_2009_4_a2/}
}