search query: @instructor Kallberg, Harri / total: 7
references: 4-7 / 7
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title | year | author | ||
4. | 1983 | Kivimäki, Jukka |
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5. | 1982 | Iikkanen, Pekka |
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6. | 1976 | Laine, Pertti |
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7. | 1973 | Salusjärvi, Markku |
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