Jevbratt, L., C. Lagergren, and B. Sarby. “Direct Beam Control in Radiotherapy With High Energy Photons”. Acta Oncologica 10, no. 4 (January 1, 1971): 433–442. Accessed May 17, 2026. https://medicaljournalssweden.se/actaoncologica/article/view/33994.