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| systems study | |||
| system research | |||
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| systems study | |||
| system researches | |||
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системное исследование : 19 a las frases, 9 temas |
| Astronáutica | 2 |
| Aviación | 1 |
| Electrónica | 1 |
| Formal | 1 |
| General | 2 |
| Industria energetica | 3 |
| Makárov | 1 |
| Naciones unidas | 1 |
| Término militar | 7 |