@article{DAN_1975_225_6_a10,
     author = {M. A. Shubin},
     title = {The {Favard--Muhamadiev} theory and pseudo-differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {1278--1280},
     publisher = {mathdoc},
     volume = {225},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a10/}
}