1. MAIS Laboratory, MAMCS Group, FST Errachidia, Moulay Ismail University of Meknes, P. O. Box 509, Errachidia 52000, Morocco
2. Department of Information Technology, Escuela Politecnica Superior, Universidad San Pablo-CEU, CEU Universities, Campus Monteprincipe, Boadilla del Monte, Madrid 28668, Spain
3. Department of Mathematics and Education, Universidad a Distancia de Madrid, Spain
4. Department of Mathematics, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Khyber Pakhtunkhwa, Pakistan
5. Faculty of Exact Sciences and Informatics, Mathematic Department, Hassiba Benbouali University, Chlef, Algeria