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In: Plav ISSN 1802-4734 Roč. 11, 2015, č. 12, s. 6
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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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In: Matemaattisten aineiden aikakauskirja. - ISSN 0025-5149. - 48(1984) : 3, s.287
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