@article{article, title = {{Ballistic Focusing of Polyenergetic Protons Driven by Petawatt Laser Pulses}}, publisher = {{American Physical Society (APS)}}, url = {{}}, year = {{2011}}, month = {{6}}, author = {{Kar S and Markey K and Borghesi M and Carroll DC and McKenna P and Neely D and Quinn MN and Zepf M}}, doi = {{10.1103/physrevlett.106.225003}}, volume = {{106}}, journal = {{Physical Review Letters}}, issue = {{22}}, note = {{Accessed on 2025/07/10}}}