[n] P. Sprangle, H. Freund, B. Hafizi, and J. Penano, “Optical Beam Quality in Free-Electron Lasers”, in Proc. FEL'06, Berlin, Germany, Aug.-Sep. 2006, paper MOPPH044, pp. 134-137.
[n] P. Sprangle, B. Hafizi, and J. Penano, “Optically Guided, Compact, High-Power FEL Amplifier for Atmospheric Propagation”, in Proc. FEL'06, Berlin, Germany, Aug.-Sep. 2006, paper MOPPH045, pp. XX-XX.
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