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by: Karppanen, Esko (1954- )

In: Opettaja. - ISSN 0355-3965. - 2002 : 51-52, s.51
Journal article
no cover found
by: Jääskä, Marjo.

In: Opettaja. - ISSN 0355-3965. - 101(2007) : 51-52, s.41
Journal article

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