Research output: Contribution to journal › Article › peer-review
| Original language | English |
|---|---|
| Pages (from-to) | 197-203 |
| Number of pages | 7 |
| Journal | Vestnik St. Petersburg University: Mathematics |
| Volume | 49 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2016 |
ID: 135499031