Waggas Galib AtshanProfessor of Mathematics, University of Al-Qadisiyah, College of SciencePotvrđena adresa e-pošte na qu.edu.iq
Al-Jawari, Naseif J.Assistant Professor in the Mathematics Department, Faculty of Sciences, Al-Mustansiriya UniversityPotvrđena adresa e-pošte na uomustansiriyah.edu.iq