1. The observer error in peripheral blood cell classification;Bacus;Am. J. Clin. Pathol.,1973
2. The unavoidable error in the differential count of the leukocytes of the blood;Barnett;J. Clin. Invest,1933
3. Living Blood Cells and Their Ultrastructure. Translated by Robert I. Weed;Bessis,1973
4. When to do diffs: How often should differential counts be repeated?;Brecher;Blood Cells,1980
5. Characterization of the WBC differential count;Bull;Blood Cells,1980