Bull. Korean Math. Soc. 2013; 50(2): 399-405
Printed March 31, 2013
https://doi.org/10.4134/BKMS.2013.50.2.399
Copyright © The Korean Mathematical Society.
Andreas O. Bender, Bo-Hae Im, and Yoonjin Lee
Pohang University of Science and Technology, Chung-Ang University, Ewha Womans University
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