Bull. Korean Math. Soc. 1993; 30(1): 17-23
Printed June 1, 1993
Copyright © The Korean Mathematical Society.
Hong Kyung Pak and Jin Suk Pak
Kana- zawa University and Kyungpook National University
2020; 57(6): 1501-1509
2011; 48(4): 769-777
© 2022. The Korean Mathematical Society. Powered by INFOrang Co., Ltd