Green, J. S., Dover, N. P., Borghesi, M., Brenner, C. M., Cameron, F. H., Carroll, D. C., et al. (2014). Enhanced proton beam collimation in the ultra-intense short pulse regime. Plasma Physics and Controlled Fusion, 56(8): 084001. doi:10.1088/0741-3335/56/8/084001.