search query: @instructor Hirsi, Hannu / total: 67
references: 65-67 / 67
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| title | year | author | ||
| 65. | 1980 | Pursiainen, Jorma |
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| 66. | 1980 | Vanhanen, Pekka |
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| 67. | 1980 | Kristeri, Hilkka |
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INSSI