search query: @supervisor Rikkonen, Harri / total: 23
references: 21-23 / 23
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| title | year | author | ||
| 21. | 1974 | Multamäki, Heikki |
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| 22. | 1974 | Keihäri, Eero |
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| 23. | 1974 | Haartman, Jan von |
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