I. Mathar, O. W. K. Handayani, E. Widowati, and I. Zainafree, “Systemic Barriers to Preventing Fraud in National Health Insurance (JKN) Claims: Perspectives from Regional Hospitals and BPJS Kesehatan”, Tec Empre Journal, vol. 21, no. 1, pp. 30–53, Jan. 2026.