NØRGAARD JENSEN , O.; DE FINE OLIVARIUS , N.; HYLTOFT PETERSEN , P.; KLITGAARD , N. A.; BLAABJERG , O.; HØRDER , M. 6.1.1.1 Discrepancy in HbA1c Measurements Performed at Different Local Laboratories and at a Selected Central Reference Laboratory. Upsala Journal of Medical Sciences, v. 98, n. 3, p. 275-282, 1 Sep. 1993.