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Czechoslovak Mathematical Journal > 2018 > 68 > 3 > 657-660
Open Mathematics > 2013 > 11 > 5 > 900-909
Central European Journal of Mathematics > 2013 > 11 > 5 > 900-909
Czechoslovak Mathematical Journal > 2018 > 68 > 3 > 657-660
Open Mathematics > 2013 > 11 > 5 > 900-909
Central European Journal of Mathematics > 2013 > 11 > 5 > 900-909