1. Department of Mathematics, Cankaya University, Ankara 06530, Turkey
2. Department of Computer Science and Engineering, BRAC University, Dhaka 1212, Bangladesh
3. Department Mathematics, Gheorghe Asachi Tech University, Iasi 700506, Romaniaa
4. Department Mathematics & Mechanics, St Petersburg University, Univ Skii 28, St Petersburg 198504, Russia
5. Covenant University, 10 Idiroko Road, Canaan Land, Ota, Ogun State, Nigeria