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references: 4-5 / 5
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title | year | author | ||
4. | 1971 | Virtanen, Risto |
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5. | 1948 | Sulonen, Martti Seppo |
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INSSI
title | year | author | ||
4. | 1971 | Virtanen, Risto |
||
5. | 1948 | Sulonen, Martti Seppo |