NASUTION, N. Analysis of statistic health care as indicators of efficiency service in Semen Padang Hospital through Barber Johnson graph. International Journal Of Community Medicine And Public Health, [S. l.], v. 7, n. 2, p. 427–430, 2020. DOI: 10.18203/2394-6040.ijcmph20200409. Disponível em: https://www.ijcmph.com/index.php/ijcmph/article/view/5732. Acesso em: 25 oct. 2025.