@article{DE_1992_28_1_a14,
     author = {V. S. Serov},
     title = {Absolute convergence of spectral expansions of operators with a singularity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {127--136},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_1_a14/}
}