koclega@ux2.math.us.edu.pl
szostok@ux2.math.us.edu.pl
swasowicz@ath.bielsko.pl
© 2012 Barbara Koclęga-Kulpa, Tomasz Szostok, Szymon Wąsowicz, published by Slovak Academy of Sciences, Mathematical InstituteThis work is licensed under the Creative Commons License.