search query: @keyword maintenance / total: 107
references: 105-107 / 107
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| title | year | author | ||
| 105. | 1991 | Hänninen, Seppo Ilmari |
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| 106. | 1988 | Simojoki, Antti |
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| 107. | 1980 | Räty, Juha |
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