Chesov, I. I. “Assessment of Spread and Distribution Pattern of Contrast Dye Injected under Ultrasound Guidance in the Transverse Abdominal Plane. A Cadaveric Study”. Pain Medicine, vol. 2, no. 2, June 2017, pp. 70-74, https://painmedicine.org.ua/index.php/pnmdcn/article/view/56.