But-Hadzic, Jasna, et al. “The Spine and Carina As a Surrogate for Target Registration in Cone-Beam CT Imaging Verification in Locally Advanced Lung Cancer Radiotherapy”. Radiology and Oncology, vol. 57, no. 1, Mar. 2023, pp. 86-94, https://www.radioloncol.com/index.php/ro/article/view/3903.