M. Nuraeni, L. Sudarmi, and G. Y. N. Panggabean, “The Effect of Free Space Variation in 3 mL K₂EDTA Vacuum Tube on the Accuracy of Hematocrit and Red Blood Cell Count Tests”, Jurnal Riset Kesehatan, vol. 15, no. 1, pp. 110–117, May 2026.