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Open Mathematics > 2011 > 9 > 5 > 1156-1163
Open Mathematics > 2010 > 8 > 1 > 53-72
Open Mathematics > 2009 > 7 > 4 > 660-669
Open Mathematics > 2011 > 9 > 5 > 1156-1163
Open Mathematics > 2010 > 8 > 1 > 53-72
Open Mathematics > 2009 > 7 > 4 > 660-669