1. Department of Mathematics Mohamed El Bachir El Ibrahimi University Bordj Bou Arreridj Algeria
2. Department of Mathematics Higher School of Technological Education, Azzaba Skikda Algeria
3. Department of Mathematics, College of Sciences and Arts Qassim University Ar‐Rass Saudi Arabia
4. Laboratoire de Mathématiques Appliquées et de Modélisation Université 8 Mai 1945 Guelma. B.P. 401 Guelma 24000 Algérie