F.S. Tsung, T. Antonsen, D.L. Bruhwiler, J.R. Cary, V.K. Decyk, E. Esarey, C.G.R. Geddes, C. Huang, A. Hakim, T. Katsouleas, W. Lu, P. Messmer, W.B. Mori, M. Tzoufras and J. Vieira, “Three-Dimensional Particle-in-Cell Simulations of Laser Wakefield Experiments,” J. Physics: Conference Series 78, 012077 (2007).