Li, Jie, et al. “A Retrospective Study on Improving the Accuracy of Radiotherapy for Breast Cancer Patients With Lymph Node Metastasis Using Styrofoam”. Radiology and Oncology, vol. 58, no. 1, Feb. 2024, pp. 124-32, https://www.radioloncol.com/index.php/ro/article/view/4103.