Mattei, I., Bini, F., Collamati, F., De Lucia, E., Frallicciardi, P. M., Iarocci, E., Mancini-Terracciano, C., Marafini, M., Muraro, S., Paramatti, R., Patera, V., Piersanti, L., Pinci, D., Rucinski, A., Russomando, A., Sarti, A., Sciubba, A., Solfaroli Camillocci, E., Toppi, M., Traini, G., Voena, C., & Battistoni, G. (n.d.). secondary radiation measurements for particle therapy applications: prompt photons produced by 4He, 12C and 16O ion beams in a PMMA target. Physics in medicine & biology, 62, 1438–1455. http://access.bl.uk/ark:/81055/vdc_100087651436.0x000051