Open Mathematics
Open Mathematics > 2017 > 15 > 1 > 508-519
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Open Mathematics > 2017 > 15 > 1 > 616-627
Open Mathematics > 2017 > 15 > 1 > 508-519
Open Mathematics > 2017 > 15 > 1 > 218-232
Open Mathematics > 2017 > 15 > 1 > 616-627