search query: @instructor Vahtikari, Katja / total: 17
references: 15-17 / 17
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| title | year | author | ||
| 15. | 2009 | Haapatalo, Kim |
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| 16. | 2007 | Laaksonen, Laura |
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| 17. | 2004 | Hanhijärvi, Titta |
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