1. Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia
2. Departamento de Matematica, Universidade Federal do Amazonas-UFAM, Manaus-AM, Brazil
3. Department of Mathematics and Computer Science, North University Center of Baia Mare, Technical University of Cluj Napoca, Baia Mare, Romania
4. Department of Mathematics, College of Science and Arts, Muhayil, King Khalid University, Abha, Saudi Arabia