J. Korean Math. Soc. 1995; 32(1): 93-101
Printed March 1, 1995
Copyright © The Korean Mathematical Society.
Kouei Sekigawa, Hiroshi Suga, and Lieven Vanhecke
Niigata University
2001; 38(6): 1107-1116
2011; 48(1): 23-31
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