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Published Online: Mar 26, 2024
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DOI: https://doi.org/10.2478/amns.2023.2.01720
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Applied Mathematics and Nonlinear Sciences 7.1 (2019) 111-120
DOI: 10.2478/amns.2019.1.00011
This paper has been retracted, beacuse it has already been published in the same issue: pp. 9-20 with the assigned DOI: 10.2478/amns.2019.1.00002