J. Korean Math. Soc. 1997; 34(4): 895-909
Printed December 1, 1997
Copyright © The Korean Mathematical Society.
Jong-Yeoul Park, Jun-Hong Ha, and Hyo-Keun Han
Pusan National University, Pusan National University and Pusan National University
2000; 37(4): 625-643
2003; 40(5): 769-788
2009; 46(5): 1007-1025
2009; 46(5): 1105-1117
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