search query: @keyword loudspeakers / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2016 | Järvinen, Hannu Juhani |
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| 2. | 2008 | Hiekkanen, Timo |
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| 3. | 1991 | Kirla, Olli |
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| 4. | 1980 | Takala, Teijo |
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