J. Korean Math. Soc. 1996; 33(4): 1115-1121
Printed December 1, 1996
Copyright © The Korean Mathematical Society.
Jong Sook Bae, Seong Hoon Cho, Kyung Jin Min, and Seung Kab Yang
MyongJi University, Hanseo University, MyongJi University, and MyongJi University
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