search query: @instructor Pennala, Erkki / total: 9
references: 6-9 / 9
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title | year | author | ||
6. | 1975 | Backman, Kaj |
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7. | 1974 | Järvinen, Jarmo |
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8. | 1972 | Ikonen, Kari |
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9. | 1971 | Pyy, Seppo |
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