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Open Mathematics > 2013 > 11 > 11 > 1923-1931
Czechoslovak Mathematical Journal > 2013 > 63 > 2 > 529-538
Central European Journal of Mathematics > 2013 > 11 > 11 > 1923-1931
Open Mathematics > 2011 > 9 > 4 > 888-896
Central European Journal of Mathematics > 2011 > 9 > 4 > 888-896