1. Blakely EA, Tobias CA, Ludewigt BA, Chu WT, Some physical and biological properties of light ions. In: Chu W, editor. Proceedings of the Fifth PTCOG Meeting & International Workshop on Biomedical Accelerators. Lawrence Berkeley Laboratories Report LBL-22962; 1986.
2. Chu WT, Ludewigt BA, Renner TR. Instrumentation for treatment of cancer using proton and light-ion beams. Lawrence Berkeley Laboratories Report LBL-33403, UC406; 1993.
3. Wambersie A, Deluca PM, Andreo P, Hendry JH. Light or heavy ions: a debate of terminology. Radiother Oncol. 2004;73(S2):iiii.
4. Vatnitsky SM, Moyers MF. Radiation therapy with light ions. In: van Dyk J, editor. The modern technology of radiation oncology v.3: A compendium for medical physicists and radiation oncologists. Wisconsin: Medical Physics Publishing; 2013. p. 183–222. ISBN: 978-1-930524-57-6.
5. Jermann M. Particle therapy statistics in 2014. Int J of Particle Therapy. 2015;2(1):50–4.