2Westgard JM, Klee GG. Quality management. In: clinical diagnosis and management by laboratory methods, edited by Henry JB.19th edition. New York:John Wiley Sons, 1998.384-419.
3Laboratory Standards National Committee of Clinical NCCLS. Method comparison and bias estimation using patient samples; Approved guideline.2nd edition.Wayne.Pennsylvania:NCCLS,2002.Ep9-A2.
4Laboratory Standards National Committee of Clinical.NCCLS. Calibration and quality control of automated hematology analyzer; Aproved guideline.Wayne.Pennsylvania:NCCLS,1999. H38-P.
