Bull. Korean Math. Soc. 1999; 36(3): 477-481
Printed September 1, 1999
Copyright © The Korean Mathematical Society.
Yong-Soo Jung
Chungnam National University
2000; 37(2): 265-272
2001; 38(3): 443-447
2001; 38(4): 709-718
2002; 39(2): 211-224
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