search query: @instructor Lindgren, Pentti / total: 14
references: 12-14 / 14
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| title | year | author | ||
| 12. | 1980 | Kurki, Reijo |
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| 13. | 1977 | Tervala, M. Juhani |
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| 14. | 1973 | Teerioja, Reijo |
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