Najafi, Mohammad, Department of mathematics, Razi university of kermanshah, kermanshah, Iran
Namah, Eman, Baghdad University
Nesvit, Kateryna, Karazin Kharkiv National University
Nkrumah, Isaac, Department of Physics, Kwame Nkrumah University of Science and Technology
Nyamoradi, N., Department of Mathematics, Faculty of science,Razi University, Kermanshah, 67149, Iran.
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