@article{ZVMMF_1979_19_5_a8,
     author = {P. N. Vabishchevich and S. A. Gabov and P. V. Shvetsov},
     title = {The angular potential for the operator $\Delta+c(x)$},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1162--1177},
     publisher = {mathdoc},
     volume = {19},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_5_a8/}
}