@article{DAN_1968_182_6_a4,
     author = {Yu. V. Egorov},
     title = {A class of pseudodifferential operators},
     journal = {Doklady Akademii Nauk},
     pages = {1261--1263},
     publisher = {mathdoc},
     volume = {182},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_182_6_a4/}
}