J. Korean Math. Soc. 2011; 48(5): 1053-1063
Printed September 1, 2011
https://doi.org/10.4134/JKMS.2011.48.5.1053
Copyright © The Korean Mathematical Society.
Sne\v zana \v C. \v Zivkovi\'c-Zlatanovi\'c, Dragan S. Djordjevi\'c, and Robin E. Harte
University of Nis, University of Nis, Trinity College Dublin
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