J. Korean Math. Soc. 2003; 40(6): 1015-1029
Printed November 1, 2003
Copyright © The Korean Mathematical Society.
Terumasa Nihonyanagi, Takashi Oguro, and Kouei Sekigawa
Niigata University, Tokyo Denki University, Niigata University
2019; 56(6): 1441-1461
1996; 33(1): 121-136
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