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Herawati, Elvina, <em>Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia</em>
Hutapea, Tri Andri, <p><em>Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia</em></p><p><em><em>Doctoral Program of Science Mathematics, Faculty Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia</
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Supama, Supama, <div class="hstack gap-3 text-darkblue mb-1">Faculty of Mathematics and Natural Sciences, <span>Departemen Matematika, FMIPA UGM, Sekip Utara - Yogyakarta 55281</span></div>
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Tulus, Tulus, <em>Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia</em>
