Bull. Korean Math. Soc. 2013; 50(5): 1451-1469
Printed September 1, 2013
https://doi.org/10.4134/BKMS.2013.50.5.1451
Copyright © The Korean Mathematical Society.
Milo\v s Arsenovi\' c and Romi F. Shamoyan
University of Belgrade, Bryansk University
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