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Open Mathematics > 2015 > 13 > 1
Open Mathematics > 2015 > 13 > 1
Annales Polonici Mathematici > 1994-1995 > 60 > 2 > 159-162
Open Mathematics > 2015 > 13 > 1
Open Mathematics > 2015 > 13 > 1
Annales Polonici Mathematici > 1994-1995 > 60 > 2 > 159-162