. . "Conference papers and proceedings" . "Conference papers and proceedings"@en . . . . . "Free-electron laser challenges 2"@en . "Free-electron laser challenges 2" . . . . . . "Free-electron laser challenges II : 26-27 January 1999, San Jose, California"@en . "Free-electron laser challenges II : 26-27 January 1999, San Jose, California" . . . . "Free-electron laser challenges II"@en . "Free-electron laser challenges II" . "Free-electron laser challenges II 26-27 January 1999, San Jose, California" . "Free-electron laser challenges two" . "Free-electron laser challenges two"@en . "Free-electron laser challenges II 26-27 January 1999, San Jose, California"@en . . . . . . . . "Society of Photo-optical Instrumentation Engineers." . . "Society of Photo-Optical Instrumentation Engineers." . "Society of Photo-optical Instrumentation Engineers" . "SPIE Conference on Free-Electron Laser Challenges (2 1999.01.26-27 San Jose, Calif.)" . . . "SPIE Digital Library." . . "Conference on Free Electron Laser Challenges" . . "Lasers à électrons libres Congrès." . .