search query: @instructor Rönkä, Heikki / total: 7
references: 4-7 / 7
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| title | year | author | ||
| 4. | 1999 | Johansson, Janne |
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| 5. | 1999 | Jussila, Paula |
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| 6. | 1997 | Wuorenjuuri, Eeva |
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| 7. | 1996 | Lahdenperä, Juha |
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