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by: Hyvärinen, Veli

In: SETA. - ISSN 0355-1407. - 1988 : 1, s.6-13
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by: Hyvärinen, Veli

In: Z. - ISSN 1238-2760. - 1998 : 6, s.18-19
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by: Hyvärinen, Veli

In: Z. - ISSN 1238-2760. - 32(2006) : 6, s.30-31
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