A.Yordanova1*, S. Gocheva-Ilieva1, H. Kulina1, L. Yordanova2, I. Marinov3 1Department of Applied Mathematics and Modeling, Faculty of Mathematics and Informatics, Plovdiv University Paisii Hilendarski, 24 Tzar Asen, 4000 Plovdiv, Bulgaria 2Department of Mathematics and Informatics, Fa
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