[1] Natl Univ Modern Languages, Fac Engn & Comp Sci, Dept Comp Sci, H-9, Islamabad, Pakistan
[2] Natl Univ Sci & Technol, Sch Nat Sci, H-12, Islamabad, Pakistan
[3] Univ Waikato, Fac Computat & Math Sci, Dept Math & Stat, Hamilton 3216, New Zealand
[4] Pontificia Univ Catolica Valparaiso, Inst Fis, Casilla 4950, Valparaiso, Chile
[5] Eastern Mediterranean Univ, Phys Dept, Arts & Sci Fac, Via Mersin 10, Famagusta, North Cyprus, Turkey