Institution: | 1. Laboratoire de Mathématiques, Université de Saïda, B.P. 138, 20000, Saïda, Algérie;2. Department of Mathematical Sciences, Florida Institute of Technology, Melbourne, FL, 32901-6975, USA;3. KFUPM Chair Professor, Mathematics and Statistics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;4. Laboratoire de Mathématiques, Université de Sidi Bel-Abbès, B.P. 89, 22000, Sidi Bel-Abbès, Algérie |