Enhanced laser intensity and ion acceleration due to self-focusing in relativistically transparent ultrathin targets by T. P. Frazer, R. Wilson, M. King, N. M. H. Butler, D. C. Carroll, M. J. Duff, A. Higginson, J. Jarrett, Z. E. Davidson, C. Armstrong, H. Liu, D. Neely, R. J. Gray, P. McKenna

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