@article{IVM_2006_2_a8,
     author = {A. N. Karapetyants and V. A. Nogin},
     title = {$L_p\to L_q$-estimates for a twisted convolution operator with a kernel that has singularities on a sphere and at the origin},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {72--75},
     publisher = {mathdoc},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2006_2_a8/}
}