J. Korean Math. Soc. 1996; 33(4): 857-863
Printed December 1, 1996
Copyright © The Korean Mathematical Society.
Jong Duek Jeon, Kan Cher Khe, Ji Hyun Park, Yong Hee Jeon, and Jong Bae Choi
Kyung Hee University, Khavarovsk State University of Techonology, Soonchunghyang University, Taegu Hyosung Catholic University and Kyung Hee University
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