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by: Korhonen, Hannu.

In: Matemaattisten aineiden aikakauskirja. - ISSN 0025-5149. - 48(1984) : 3, s.287
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by: Mårtenson, Jan.

In: Horisont. - ISSN 0439-5530. - 33(1986) : 1, s.93-94
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by: Mårtenson, Jan.

In: Horisont. - ISSN 0439-5530. - 33(1986) : 1, s. 93-94
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by: Berg, Bengt.

In: Ny tid. - ISSN 1456-0518. - Helsingfors : Tigertext. - 2008 : 41, s. 4
Ny tid. - ISSN 1456-0518. - 2008 : 41, s.4
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