By Boyd M   Sharpe I   in Annals of The Royal College of Surgeons of England

ISSN:1478-7083|95|7|529-529

The Royal College of Surgeons of England‎(2013)‎

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By Bryant V.   Sharpe I.   in European Journal of Combinatorics

ISSN:0195-6698|20|4|259-262

Elsevier‎(1999)‎

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