@article{MZM_2019_106_3_a8,
     author = {V. E. Nazaikinskii and A. I. Shafarevich},
     title = {Maslov's {Canonical} {Operator} in {Problems} on {Localized} {Asymptotic} {Solutions} of {Hyperbolic} {Equations} and {Systems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {424--435},
     publisher = {mathdoc},
     volume = {106},
     number = {3},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2019_106_3_a8/}
}