search query: @instructor Heikkilä, Pertti / total: 8
references: 6-8 / 8
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| title | year | author | ||
| 6. | 1983 | Viitala, Raimo |
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| 7. | 1983 | Naapuri, Jukka-Matti |
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| 8. | 1981 | Latva-Pukkila, Pasi |
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