Commun. Korean Math. Soc. 2018; 33(2): 507-513
Online first article January 9, 2018 Printed April 30, 2018
https://doi.org/10.4134/CKMS.c170171
Copyright © The Korean Mathematical Society.
Sh\^{u}ichi Ohno
Miyashiro, Minami-Saitama
2005; 20(1): 63-70
2006; 21(3): 465-474
2006; 21(4): 719-727
2007; 22(3): 373-382
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