Bull. Korean Math. Soc. 2005; 42(4): 869-873
Printed December 1, 2005
Copyright © The Korean Mathematical Society.
Salah Mecheri and Ahmed Bachir
King Saud University College of Science, King Khaled University
2017; 54(1): 215-223
1999; 36(2): 351-355
2003; 40(4): 685-692
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