J. Korean Math. Soc. 1995; 32(1): 103-108
Printed March 1, 1995
Copyright © The Korean Mathematical Society.
Kil-Woung Jun and Dal-Won Park
Chungnam National University and Kongju National University
2007; 44(4): 889-902
2008; 45(1): 163-176
2009; 46(3): 561-576
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