search query: @instructor Niemi, J. / total: 2
references: 1-2 / 2
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| title | year | author | ||
| 1. | 1973 | Kukkola, Arto |
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| 2. | 1961 | Rajala, Reijo |
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| title | year | author | ||
| 1. | 1973 | Kukkola, Arto |
||
| 2. | 1961 | Rajala, Reijo |