Wisudarti CFR, Mahmud, Mi’raj GG. An Ultrasonography Guidance Lumbar Epidural Anaesthesia in Patient with Difficult Landmarks. J. Kompl. Anest. [nternet]. 2023May28 [cited 2026Jul.26];10(1):70-6. vailable from: https://jurnal.ugm.ac.id/v3/jka/article/view/8329