search query: @keyword optical / total: 6
references: 5-6 / 6
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| title | year | author | ||
| 5. | 2002 | Kärkäs, Reijo |
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| 6. | 1997 | Piira, Juha |
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INSSI
| title | year | author | ||
| 5. | 2002 | Kärkäs, Reijo |
||
| 6. | 1997 | Piira, Juha |