Analisis Quality Control Internal Pemeriksaan Sgot dan Sgpt Menggunakan Grafik Levey-Jennings dan Six Sigma di RS X Yogyakarta: Internal Quality Control Analysis of Sgot and Sgpt Examination Using Levey-Jennings Graphics and Six Sigma at X Hospital Yogyakarta. Journal of Health, [S. l.], v. 12, n. 1, p. 060–068, 2025. DOI: 10.30590/joh.v12n1.1002. Disponível em: https://journal.gunabangsa.ac.id/joh/article/view/92.. Acesso em: 4 may. 2026.