Sudarwan, A. . Nurohim, D. . Sutrisno Hadi, T. . Yanuar Rahmat Syah, and E. . Angga laksana, “Health Service Process: Lean Six Sigma Concept for Hospitals (Casemix Hospitals)”, Psychosocial rehabilitation, vol. 24, no. 1, pp. 3494–3505, Feb. 2020, doi: 10.61841/w4cx0b88.