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Leo Koutaniemi, Raimo Ronkainen · Oulun yliopisto
158 sayfa · 1983
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Lauri Helenius, Raimo Ronkainen, Pertti Härkönen · Oulun yliopisto
34 sayfa · 1979
Lauri Helenius, Hannu Hänninen, Raimo Ronkainen · Oulun yliopisto
34 sayfa · 1981
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