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Cement Wapno Beton > 2019 > R. 22/84, nr 5 > 361--371
Journal of Mathematics and Applications > 2019 > Vol. 42 > 109--116
Journal of Mathematics and Applications > 2017 > Vol. 40 > 97--120
LogForum > 2016 > Vol. 12, no. 3 > 225--245