search query: @instructor Torkki, Tapio / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 1991 | Kalho, Juha |
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| 2. | 1982 | Puronto, Antti |
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| 3. | 1981 | Suoniemi, Rauno |
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| 4. | 1978 | Keskiväli, Hannu |
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