search query: @instructor Ridell, Hannu / total: 9
references: 8-9 / 9
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| title | year | author | ||
| 8. | 2004 | Hakala, Jussi |
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| 9. | 1988 | Pietilä, Paula |
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INSSI
| title | year | author | ||
| 8. | 2004 | Hakala, Jussi |
||
| 9. | 1988 | Pietilä, Paula |