@article{INTO_2018_152_a9,
     author = {S. Ya. Startsev},
     title = {Symmetry {Drivers} and {Formal} {Integrals} of {Hyperbolic} {Systems} of {Equations}},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {110--119},
     publisher = {mathdoc},
     volume = {152},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2018_152_a9/}
}