search query: @keyword energy effíciency / total: 167
references: 165-167 / 167
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| title | year | author | ||
| 165. | 2002 | Rein, Suvi |
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| 166. | 2000 | Kilponen, Leena |
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| 167. | 1994 | Hietaniemi, Janne |
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