search query: @keyword certificate / total: 22
references: 21-22 / 22
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| title | year | author | ||
| 21. | 1998 | Lehti, Ilari |
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| 22. | 1997 | Kivi, Jaakko |
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INSSI
| title | year | author | ||
| 21. | 1998 | Lehti, Ilari |
||
| 22. | 1997 | Kivi, Jaakko |