J. Korean Math. Soc. 2010; 47(2): 373-383
Printed March 1, 2010
https://doi.org/10.4134/JKMS.2010.47.2.373
Copyright © The Korean Mathematical Society.
WaadAllah T. Sulaiman
University of Mosul
2001; 38(1): 163-176
2006; 43(3): 563-578
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