Bull. Korean Math. Soc. 2012; 49(3): 647-653
Printed May 1, 2012
https://doi.org/10.4134/BKMS.2012.49.3.647
Copyright © The Korean Mathematical Society.
Jong-Gug Yun
Korea National University of Education
2014; 51(6): 1591-1603
2014; 51(2): 567-577
2012; 49(6): 1241-1250
1998; 35(2): 301-309
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