Download the full article as a PDF file.
© 2016 Mirjanka Madjevikj, Biljana Apostolovska Toshevska, Svemir Gorin, Marija Ljakoska, published by University of Silesia in Katowice, Institute of Mathematics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.