Commun. Korean Math. Soc. 2016; 31(3): 483-493
Printed July 31, 2016
https://doi.org/10.4134/CKMS.c150167
Copyright © The Korean Mathematical Society.
Naknimit Akkasriworn, Duangkamon Kitkuan, and Anantachai Padcharoen
Rambhai Barni Rajabhat University, Rambhai Barni Rajabhat University, Rambhai Barni Rajabhat University
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