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Afrika Matematika > 2016 > 27 > 3-4 > 529-540
SeMA Journal > 2015 > 72 > 1 > 37-46
Computers and Mathematics with Applications > 2009 > 58 > 2 > 239-247
Afrika Matematika > 2016 > 27 > 3-4 > 529-540
SeMA Journal > 2015 > 72 > 1 > 37-46
Computers and Mathematics with Applications > 2009 > 58 > 2 > 239-247