Bull. Korean Math. Soc. 1997; 34(2): 317-334
Printed June 1, 1997
Copyright © The Korean Mathematical Society.
Jae Moon Ahn, Kun Soo Chang, Jeong Gyoo Kim, Jung Won Ko, and Kun Sik Ryu
Kun-kuk University, Yonsei University, University of Nebraska, University of Nebraska, Hannam University
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