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Afrika Matematika > 2016 > 27 > 5-6 > 949-961
Arabian Journal for Science and Engineering > 2011 > 36 > 3 > 393-403
Journal of Mathematical Analysis and Applications > 2008 > 341 > 1 > 1-11
Afrika Matematika > 2016 > 27 > 5-6 > 949-961
Arabian Journal for Science and Engineering > 2011 > 36 > 3 > 393-403
Journal of Mathematical Analysis and Applications > 2008 > 341 > 1 > 1-11