I. Utami, F. Suryaningrum, and D. Ispriyanti, “K-MEANS CLUSTER COUNT OPTIMIZATION WITH SILHOUETTE INDEX VALIDATION AND DAVIES BOULDIN INDEX (CASE STUDY: COVERAGE OF PREGNANT WOMEN, CHILDBIRTH, AND POSTPARTUM HEALTH SERVICES IN INDONESIA IN 2020)”, BAREKENG: J. Math. & App., vol. 17, no. 2, pp. 0707-0716, Jun. 2023.