| Verfasser | Häufigkeit |
| Grišanova, O. F. |
6 |
| Nikolaeva, N. D. |
6 |
| Voronina, Irina A. |
6 |
| Atanasov, Atanas |
1 |
| Boneva, Svetla |
1 |
| Brusarski, Rumen |
1 |
| Christova, Irena Nikolaeva |
1 |
| Karpeev, Igorʹ Vjačeslavovič 1954-2015 |
1 |
| Nikolaeva, D. K. |
1 |
| Oresharski, Plamen |
1 |
| Stoyanov, Velcho |
1 |
| Trifonova, Silvia |
1 |
| Čistjakova, O. V. |
1 |