Amer, S. A., S. A. Alshoabi, A. A. Qurashi, F. H. Alhazmi, and R. Y. Al-Rudini. “Ultrasound Doppler Findings of a Twin Reversed Arterial Perfusion Sequence (TRAP)”. Pakistan Journal of Medical Sciences, Vol. 40, no. 1, Nov. 2023, doi:10.12669/pjms.40.1.8088.