Bull. Korean Math. Soc. 2014; 51(4): 1187-1193
Printed July 1, 2014
https://doi.org/10.4134/BKMS.2014.51.4.1187
Copyright © The Korean Mathematical Society.
Sh\^{u}ichi Ohno
Nippon Institute of Technology
2023; 60(3): 649-657
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