Muhammad Nasrullah, Abdul Wahab Gureja, Muhammad Younus, Salman Kazmi, Rabbia Abbas, and Asif Hanif. “Association of Inferior Vena Cava Diameter and Compressibility Index With Central Venous Pressure”. Pakistan Journal of Medical Research, vol. 65, no. 1, Apr. 2026, pp. 8-12, https://pjmr.org.pk/index.php/pjmr/article/view/1673.