Analisis Faktor Penyebab Perubahan Kontrak Pada Pekerjaan Pembangunan RS UPT Vertikal Surabaya : Analysis Factors Causing Contract Changes In The Construction Of UPT Vertical Hospital Surabaya RS UPT Vertikal Surabaya. CONCRETE: Construction and Civil Integration Technology, [S. l.], v. 3, n. 01, p. 10–17, 2025. DOI: 10.25139/concrete.v3i01.9958. Disponível em: https://ejournal.unitomo.ac.id/index.php/concrete/article/view/9958. Acesso em: 16 jun. 2026.