Herald of the Bauman Moscow State Technical University Series Natural Sciences Certificate of registration SMI PI no. 77-3654 from June 9, 2000, ISSN 1812-3368 (Print), ISSN 2686-8768 (Online)

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Anwer Twana Mohammed Kak --- Department of Physics, College of Education, Salahaddin University (Kirkuk Road, Erbil, Kurdistan Region, 44002 Iraq).

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