À propos de cet article
Publié en ligne: 06 juin 2014
Pages: 39 - 46
Reçu: 18 janv. 2013
DOI: https://doi.org/10.2478/ausm-2014-0003
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© 2014
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Zoltán Finta
Babeş-Bolyai University Department of Mathematics 1, M. Kogălniceanu st., 400084 Cluj-Napoca, Romania