[1] Maejo Univ, Fac Sci, Dept Math, Chiang Mai 50290, Thailand
[2] Thiruvalluvar Univ, Dept Math, Vellore 632115, Tamil Nadu, India
[3] Deakin Univ, Inst Intelligent Syst Res & Innovat, Waurn Ponds, Vic 3216, Australia
[4] Suranaree Univ Technol, Sch Math, Inst Sci, Nakhon Ratchasima 30000, Thailand
[5] Phuket Rajabhat Univ, Fac Sci & Technol, Dept Math, Phuket 83000, Thailand