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by: Köppä, Lassi.

In: Aikuiskasvatus. - ISSN 0358-6197. - 26(2003) : 4, s.318-319
Journal article
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by: Hämäläinen, Kauko.

In: Aikuiskasvatus. - ISSN 0358-6197. - 17(1997) : 4, s.323-324
Journal article
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