@article{DE_1975_11_11_a7,
     author = {V. P. Orlov},
     title = {Fractional powers of degenerate differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1980--1989},
     publisher = {mathdoc},
     volume = {11},
     number = {11},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_11_a7/}
}