T. A. Khan, S. Q. Ali Shah, M. M. Riaz, O. A. Mateen, M. H. Beg, and M. H. Sharif, “A Comparison of Palpation Technique versus Ultrasound-Guidance for Arterial Line Placement by Residents in a Teaching Institution”, PAFMJ, vol. 72, no. 6, pp. 2147–50, Dec. 2022.