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no cover found
by: Hakala, Jari.

In: Energiauutiset. - ISSN 1237-6388. - 2015 : 6, s.10-13
Journal article
no cover found
by: Hakala, Jari E.

In: Ilkka. - ISSN 0356-1283. - 2009-04-03, s.1, 4
Journal article
no cover found
by: Hakala, Jari.

In: Opettaja. - ISSN 0355-3965. - Helsinki : Opettajien ammattijärjestö OAJ. - 92 (1997) : 51-52, s. 41
Journal article
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