search query: @instructor Valve, Matti / total: 4
references: 1-4 / 4
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title | year | author | ||
1. | 2005 | Piikkilä, Eija |
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2. | 1999 | Hakkila, Kirsi |
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3. | 1993 | Sikow, Marina |
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4. | 1992 | Pelkonen, Markku |
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