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by: Backman, Leo.

In: TM : Tekniikan maailma. - ISSN 0355-4287. - 2016 : 23, s. 80
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by: Backman, Leo.

In: Hifi-lehti. - ISSN 0357-0738. - 1992 : 11, s.61
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by: Backman, Leo.

In: TM : Tekniikan maailma. - ISSN 0355-4287. - 2015 : 18E, s. 110
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