Ang, Mark Angelo, and Karen Cybelle Sotalbo. “Quantifying Total Allowable Error Violations in Serum-Sodium Quality Control: A Computer Simulation Experiment of Two- to Six-Sigma Processes”. The Philippine Journal of Pathology 10, no. 2 (October 23, 2025): 25–32. Accessed April 24, 2026. https://www.philippinejournalofpathology.org/index.php/PJP/article/view/535.