search query: @instructor Helander, Heikki / total: 3
references: 1-3 / 3
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| title | year | author | ||
| 1. | 2010 | Järvinen, Tero Oskari |
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| 2. | 2008 | Saikkonen, Antti Tapani |
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| 3. | 1995 | Hakala, Tom |
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