Penttilä , I.M., Gävert , J., Julkunen , A. and Rantanen , T. 1993. 6.2.2 Quality Specifications for Glycated Hemoglobin A1c. Upsala Journal of Medical Sciences. 98, 3 (Sep. 1993), 395-399. DOI:https://doi.org/10.3109/03009739309179338.