By Hai D. D.   Shivaji R.   in Proceedings Section A: Mathematics - Royal Society of Edinburgh

ISSN:1473-7124|134|1|137-141

Royal Society of Edinburgh‎(2004)‎

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By Hai D. D.   Smith R. C.   in Proceedings Section A: Mathematics - Royal Society of Edinburgh

ISSN:1473-7124|136|4|779-784

Royal Society of Edinburgh‎(2006)‎

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By Hai D. D.   Smith R. C.   in Mathematics Magazine

ISSN:1930-0980|81|4|295-300

Mathematical Association of America‎(2008)‎

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