By Mercer P. R.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|30|1|146-148

Taylor & Francis Ltd‎(1999)‎

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By Mercer P. R.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|32|2|308-312

Taylor & Francis Ltd‎(2001)‎

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By Mercer P.R.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|205|2|508-511

Academic Press‎(1997)‎

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