search query: @instructor Perttuli, R. / total: 2
references: 1-2 / 2
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| title | year | author | ||
| 1. | 1963 | Peltola, Pekka |
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| 2. | 1959 | Rissa, A. |
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INSSI
| title | year | author | ||
| 1. | 1963 | Peltola, Pekka |
||
| 2. | 1959 | Rissa, A. |