MODEL FOR LEAN SERVICE MEASUREMENT MANAGEMENT IN PRIVATE UNIVERSITIES OF NORTH SUMATERA. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 8, n. 4, p. 5532–5536, 2025. DOI: 10.54314/jssr.v8i4.5173. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/5173.. Acesso em: 14 jul. 2026.