@article{MMO_1986_49_a1,
     author = {L. A. Kalyakin},
     title = {Asymptotic integration of a~perturbed hyperbolic system of equations in the class of conditionally periodic functions},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {56--70},
     publisher = {mathdoc},
     volume = {49},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1986_49_a1/}
}