1. International Islamic University, Department of Mathematics, Islamabad, Pakistan
2. Faculty of Mathematics, Beograd
3. Ton Duc Thang University, Nonlinear Analysis Research Group, Ho Chi Minh City, Vietnam + Ton Duc Thang University, Faculty of Mathematics and Statistics, Ho Chi Minh City, Vietnam
4. Riphah International University, Department of Mathematics and Statistics, Islamabad, Pakistan
5. Shri Vaishnav Institute of Technology & Science Gram Baroli, Department of Applied Mathematics, Indore, India