search query: @instructor Lehtinen, Pekka / total: 9
references: 6-9 / 9
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| title | year | author | ||
| 6. | 2003 | Raitio, Riikka |
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| 7. | 2002 | Sippola, Soili |
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| 8. | 1993 | Nieminen, Marko |
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| 9. | 1984 | Aaltonen, Jukka |
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