@article{DE_1986_22_1_a15,
     author = {V. S. Serov},
     title = {Fractional powers of a differential operator with singularity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {134--142},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_1_a15/}
}