[1] Khawaja Fareed Univ Engn & Informat Technol, Dept Math, Rahim Yar Khan, Pakistan
[2] Univ Lahore, Dept Math & Stat, Lahore 54590, Pakistan
[3] Siirt Univ, Art & Sci Fac, Dept Math, TR-56100 Siirt, Turkey
[4] Ghazi Univ, Dept Math, D G Khan, Pakistan
[5] Lodz Univ Technol, Dept Automat Biomech & Mechatron, PL-90924 Lodz, Poland
[6] Univ Management & Technol, Dept Math, Lahore 54770, Pakistan
[7] Univ Free State, Inst Groundwater Studies, ZA-9301 Bloemfontein, South Africa