@article{RM_1969_24_5_a11,
     author = {Yu. V. Egorov},
     title = {The canonical transformations of pseudodifferential operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {24},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1969_24_5_a11/}
}