Bull. Korean Math. Soc. 2009; 46(4): 713-720
Printed July 1, 2009
https://doi.org/10.4134/BKMS.2009.46.4.713
Copyright © The Korean Mathematical Society.
Seunghun Yi
Youngdong University
2010; 47(5): 951-960
2020; 57(1): 207-218
2019; 56(1): 253-263
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