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Journal of the Egyptian Mathematical Society > 2016 > 24 > 4 > 522-525
Annales Polonici Mathematici > 1993 > 58 > 3 > 267-273
Journal of the Egyptian Mathematical Society > 2016 > 24 > 4 > 522-525
Annales Polonici Mathematici > 1993 > 58 > 3 > 267-273