search query: @keyword toughness / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2009 | Lotta, Juho |
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| 2. | 2009 | Manninen, Petri |
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| 3. | 2004 | Ala-Kleme, Sanna |
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| 4. | 2002 | Toivola, Juha |
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