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Clinical Chemistry|August 1, 1994
Candidate reference method for determining serum theophylline applied to target-setting in external quality assessment and routine method evaluationL M Thienpont, B Van Nieuwenhove, D Stöckl, et al.European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies|October 1, 1996
Determination of reference method values by isotope dilution-gas chromatography/mass spectrometry: a five years' experience of two European Reference LaboratoriesL M Thienpont, B Van Nieuwenhove, D Stöckl, et al.Pageof 1