search query: @keyword systems / total: 3
references: 2-3 / 3
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| title | year | author | ||
| 2. | 1997 | Vartola, Anni |
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| 3. | 1981 | Huomo, Tapio |
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INSSI
| title | year | author | ||
| 2. | 1997 | Vartola, Anni |
||
| 3. | 1981 | Huomo, Tapio |