[1
]Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
[2
]Department of Studies and Research in Mathematics, Davangere University, Davangere,
India
[3
]Department of Mathematics, COMSATS University Islamabad, Sahiwal, Pakistan
[4
]Department of Mathematics and Statistics, Riphah International University I-14, Islamabad,
Pakistan
[5
]Department of Mathematics, College of Sciences, King Khalid University, Abha, Saudi
Arabia