FraserCGPeakeMJ. Problems associated with clinical chemistry quality control materials. CRC Crit Revs Clin Lab Sci1980; 12: 59–86.
3.
YoungDSHarrisEKCotloveE.Biological and analytic components of variation in long-term studies of serum constituents in normal subjects. IV. Results of a study designed to eliminate long-term analytic deviations. Clin Chem1971; 17: 403–10.
4.
FraserCG. The application of theoretical goals based on biological variation data in proficiency testing. Arch Pathol Lab Med1988; 112: 404–15.