J. Korean Math. Soc. 2023; 60(3): 479-501
Online first article April 13, 2023 Printed May 1, 2023
https://doi.org/10.4134/JKMS.j210448
Copyright © The Korean Mathematical Society.
Hyenho Lho
Chungnam National University
2001; 38(5): 1061-1068
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