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Acta Neophilologica > 2017 > XIX/2 > 117-131
Theoretical Foundations of Chemical Engineering > 2015 > 49 > 4 > 422-426
Educational Studies in Mathematics > 2011 > 77 > 2-3 > 247-265
Educational Studies in Mathematics > 2006 > 61 > 1-2 > 103-131
Mathematical Notes > 2006 > 80 > 5-6 > 679-691