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by: Hurtta, Boris.

In: Portti. - ISSN 0359-114X. - 27(2008) : 1, s.4-12
Portti. - ISSN 0359-114X. - 27(2008) : 2, s.4-13
Portti. - ISSN 0359-114X. - 27(2008) : 3, s.4-10
Journal article

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