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Proficiency testing: how laboratories measure up to the competitionWalker, Ronald F.; Moore, Heather M.; Roberts, David; Harriott, Michael; Burns, Duncan Thorburn; O'Mahony, T. Karl P.; Cox, A. Peter; Roberts, David J.; White, Stephen; Robertson, Alan M.; Farnan, Dell; Littlejohn, David; Brown, Michael; Dowle, Christopher J.; Goodwin, Elizabeth · Analytical Proceedings · 1993