search query: @instructor Virta, Jouko / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2001 | Hirvonen, Ari |
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| 2. | 1995 | Mäentausta, Jarmo |
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| 3. | 1987 | Romu, Kari |
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| 4. | 1987 | Järvenpää, Martti |
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