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International Journal of Applied Mathematics and Computer Science > 2020 > Vol. 30, no. 4 > 745--759
Economic and Environmental Studies > 2018 > 18 > 2 > 859-877
International Journal of Applied Mathematics and Computer Science > 2020 > Vol. 30, no. 4 > 745--759
Economic and Environmental Studies > 2018 > 18 > 2 > 859-877