| 1 | at the same time | | | | | | | 4 | 0.27% |
| 2 | fauna of the balkan | | | | | | | 3 | 0.20% |
| 3 | formation and conservation of | | | | | | | 2 | 0.13% |
| 4 | studies of model invertebrate | | | | | | | 2 | 0.13% |
| 5 | and conservation of the | | | | | | | 2 | 0.13% |
| 6 | of the balkan peninsula | | | | | | | 2 | 0.13% |
| 7 | the problems of origin | | | | | | | 2 | 0.13% |
| 8 | clarifyng the problems of | | | | | | | 2 | 0.13% |
| 9 | the invertebrate fauna on | | | | | | | 2 | 0.13% |
| 10 | invertebrate fauna of the | | | | | | | 2 | 0.13% |
| 11 | of model invertebrate genera | | | | | | | 2 | 0.13% |
| 12 | of the invertebrate fauna | | | | | | | 2 | 0.13% |
| 13 | the same time the | | | | | | | 2 | 0.13% |
| 14 | in bulgaria is about | | | | | | | 2 | 0.13% |
| 15 | species composition and the | | | | | | | 2 | 0.13% |
| 16 | insufficient research combined with | | | | | | | 1 | 0.07% |
| 17 | and to solving various | | | | | | | 1 | 0.07% |
| 18 | related problems rich fauna | | | | | | | 1 | 0.07% |
| 19 | analysis and organisation lack | | | | | | | 1 | 0.07% |
| 20 | data analysis and organisation | | | | | | | 1 | 0.07% |
| 21 | of data analysis and | | | | | | | 1 | 0.07% |
| 22 | problems rich fauna insufficient | | | | | | | 1 | 0.07% |
| 23 | fauna insufficient research combined | | | | | | | 1 | 0.07% |
| 24 | methods of data analysis | | | | | | | 1 | 0.07% |
| 25 | new methods of data | | | | | | | 1 | 0.07% |
| 26 | of new methods of | | | | | | | 1 | 0.07% |
| 27 | rich fauna insufficient research | | | | | | | 1 | 0.07% |
| 28 | use of new methods | | | | | | | 1 | 0.07% |
| 29 | research combined with poor | | | | | | | 1 | 0.07% |
| 30 | home team news papers | | | | | | | 1 | 0.07% |
| 31 | and organisation lack of | | | | | | | 1 | 0.07% |
| 32 | the phylogeny of the | | | | | | | 1 | 0.07% |
| 33 | balkans the objective of | | | | | | | 1 | 0.07% |
| 34 | the balkans the objective | | | | | | | 1 | 0.07% |
| 35 | of the balkans the | | | | | | | 1 | 0.07% |
| 36 | fauna of the balkans | | | | | | | 1 | 0.07% |
| 37 | the fauna of the | | | | | | | 1 | 0.07% |
| 38 | of the fauna of | | | | | | | 1 | 0.07% |
| 39 | phylogeny of the fauna | | | | | | | 1 | 0.07% |
| 40 | a contemporary view on | | | | | | | 1 | 0.07% |