Vestnik St. Petersburg University: Mathematics > 2015 > 48 > 2 > 66-71
Source
Abstract
Identifiers
journal ISSN : | 1063-4541 |
journal e-ISSN : | 1934-7855 |
DOI | 10.3103/S1063454115020041 |
Vestnik St. Petersburg University: Mathematics > 2015 > 48 > 2 > 66-71
journal ISSN : | 1063-4541 |
journal e-ISSN : | 1934-7855 |
DOI | 10.3103/S1063454115020041 |