1) Bragg, W. H. and Kleeman, R., On the Ionization Curves of Radium, Philosophical Magazine, 8, 726-738(1904)
2) Wilson, R. R., Radiological use of fast protons, Radiol., 47, 487-491(1946);also see, Wilson, R. R., Foreword to the Second Int. Symp. on Hadron-therapy, in Adv. in Hadrontherapy, (U. Amaldi, B. Larsson, Y. Lemoigne, eds.), Excerpta Medica, Elsevier, Int. Congress Series 1144:ix-xiii(1995)
3) Tobias, C. A., Anger, H. O. and Lawrence, J. H., Radiological use of high energy deuterons and alpha particles, Am. J. Roentgenol., 67, 1-27(1952)
4) These early clinical studies were reviewed in:Raju, M. R., The History of Ion Beam Therapy, in Ion Beams in Tumor Therapy(Ute Lintz, ed.), Chapman & Hall, 3-9(1995)
5) Slater, J. M., Archambeau, J. O., Slater, J. D., Neilsen, I. and Preston, W., An integrated hospital-based facility for proton beam radiation therapy, Proc. of the NIRS International Workshop on Heavy Charged Particle Therapy and Related Subjects(ed. by A. Itano and T. Kanai), July 1991, Chiba, Japan, 82-91(1991)