@article{DAN_1969_184_1_a14,
     author = {V. S. Buslaev},
     title = {Invariant description of {Maslov's} canonical operator},
     journal = {Doklady Akademii Nauk},
     pages = {59--62},
     publisher = {mathdoc},
     volume = {184},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_1_a14/}
}