[1] Punjabi Univ, Dept Math, Patiala 147002, India
[2] SLIET, Dept Math, Sangrur 148106, India
[3] Zhejiang Normal Univ, Dept Math, Jinhua 321004, Zhejiang, Peoples R China
[4] King Abdulaziz Univ, Dept Math, Jeddah 21589, Saudi Arabia
[5] Univ S Florida, Dept Math & Stat, Tampa, FL 33620 USA
[6] Northwest Univ, Dept Math Sci, Mat Sci Innovat & Modelling, Mafikeng Campus, ZA-2735 Mmabatho, South Africa