Bin, J., Ma, W., Allinger, K., Wang, H. Y., Kiefer, D., Reinhardt, S., Hilz, P., Khrennikov, K., Karsch, S., Yan, X. Q., Krausz, F., Tajima, T., Habs, D., & Schreiber, J. (2013). On the small divergence of laser-driven ion beams from nanometer thick foils. Physics of Plasma, 20(7):. doi:10.1063/1.4816031.