1. Department of Mathematics, University of Okara, Okara 56300, Pakistan
2. Department of Mathematics, Faculty of Arts and Sciences, Kirklareli University, Kirklareli 39100, Turkey
3. Escuela de Ciencias Físicas y Matemáticas, Facultad de Ciencias Naturales y Exactas, Pontificia Universidad Católica del Ecuador, Sede Quito, Quito 17-01-2184, Ecuador
4. Department of Mathematical Engineering, Polytechnic University of Tirana, 1001 Tirana, Albania