search query: @keyword optical / total: 6
references: 3-6 / 6
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title | year | author | ||
3. | 2007 | Tergujeff, Renne |
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4. | 2006 | Laitinen, Ismo |
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5. | 2002 | Kärkäs, Reijo |
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6. | 1997 | Piira, Juha |
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