| Keyword | Articles |
|---|---|
| regional development | 3 |
| rural economics | 2 |
| road constructions | 2 |
| rating | 2 |
| renewable energy | 2 |
| regions | 2 |
| regional development model | 1 |
| radio stations | 1 |
| ransomware | 1 |
| risk management | 1 |
| rural development | 1 |
| religiously inspired terrorism | 1 |
| renewable energy sources | 1 |
| radicalization | 1 |
| real stock return | 1 |
| real-time dam management | 1 |
| rational decision-making | 1 |
| research | 1 |
| r-Interdiction Median Problem with Fortification | 1 |
| regional tourism development | 1 |
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