1. Nonlinear Analysis Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2. Faculty of Mathematics and Statistics, Ton Duc Thang University, Ho Chi Minh City, Vietnam
3. Department of Mathematics, Gilan-E-Gharb Branch, Islamic Azad University, Gilan-E-Gharb, Iran
4. Department of Pharmaceutical Technology, Military Medical Academy, Sofia, Serbia
5. University in Priština-Kosovska Mitrovica, Teacher education Faculty, Nemanjina bb, 38218 Leposavić, Serbia
6. Faculty of Mechanical Engineering, University of Belgrade, Beograd, Serbia