search query: @instructor Kekolahti, Pekka / total: 13
references: 11-13 / 13
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title | year | author | ||
11. | 1986 | Sonkeri, Petri |
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12. | 1983 | Boström, Kerstin |
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13. | 1982 | Laihanen, Pekka |
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