Bull. Korean Math. Soc. 2008; 45(4): 701-707
Printed December 1, 2008
Copyright © The Korean Mathematical Society.
Y\i lmaz \c{C}even and Mehmet Ali \"{O}zt\"{u}rk
S\"{u}leyman Demirel University and Ad\i yaman University
2024; 61(2): 335-353
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