search query: @keyword spectrum efficiency / total: 4
references: 1-4 / 4
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title | year | author | ||
1. | 2008 | Jäppinen, Pertti |
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2. | 2000 | Pitkänen, Anna |
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3. | 1995 | Jäppinen, Pertti |
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4. | 1992 | Malkamäki, Esa |
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