search query: @instructor Lehtonen, Tapio / total: 9
references: 6-9 / 9
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| title | year | author | ||
| 6. | 1982 | Karivaara, Eija |
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| 7. | 1982 | Marvia, Antti |
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| 8. | 1982 | Anttila, Timo |
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| 9. | 1981 | Nuppola, Heikki |
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