By Bicheng Y.   Debnath L.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|31|5|773-779

Taylor & Francis Ltd‎(2000)‎

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By Bicheng Y.   Ames L.W.F.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|223|1|347-353

Academic Press‎(1998)‎

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