search query: @instructor Helenius, Antti / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 1993 | Laine, Markku |
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| 2. | 1992 | Kullaa, Minna |
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| 3. | 1987 | Westerlund, Anders |
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| 4. | 1986 | Arola, Ilkka |
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