[1] Univ Gujrat, Dept Math, Gujrat 50700, Pakistan
[2] Int Telemat Univ Uninettuno, Sect Math, Corso Vittorio Emanuele II 39, I-00186 Rome, Italy
[3] King Khalid Univ, Coll Comp Sci, Dept Comp Engn, Abha 61413, Saudi Arabia
[4] Univ Souse, Higher Inst Appl Sci & Technol Sousse ISSATS, Cite Taffala Ibn Khaldoun, Sousse 4003, Tunisia
[5] Univ Turku, Dept Comp, Turku 20500, Finland