search query: @instructor Niskanen, Erkki / total: 5
references: 2-5 / 5
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title | year | author | ||
2. | 1974 | Keihäri, Eero |
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3. | 1963 | Koponen, Hannu |
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4. | 1961 | Niemi, Matti Aarno Olavi |
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5. | 1960 | Jussila, Eero |
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