1. Operation of a free-electron laser from the extreme ultraviolet to the water window
2. First lasing and operation of an ångstrom-wavelength free-electron laser
3. See for example, Arenholz, E.; Belkacem, A.; Cocke, L.; Corlett, J.; Falcone, R.; Fischer, P.; Fleming, G.; Gessner, O.; Hasan, M.Z.; Hussain, Z.; Kevan, S.; Kirz, J.; McCurdy, W.; Nelson, K.; Neumark, D.; Nilsson, A.; Siegmann, H.; Stocks, M.; Schafer, K.; Schoenlein, R.; Spence, J.; Weber, T.; Toward Control of Matter: Basic Energy Science Needs for a New Class of X-ray Light Sources.Proceedings of the Science for a New Class of Soft X-ray Light Sources Workshop, Berkeley, CA, October 8–10, 2007; LBNL Report LBNL-1034E (September 24, 2008)
4. Design Studies for a VUV–Soft X-ray Free-Electron Laser Array
5. Walker, R.P.; Bartolini 1,R.; Christou, C.; Han, J.H.; Kay, J.; Martin 1, I.P.; Rehm, G.; Rowland, J.; Angal-Kalinin, D.; Clarke, J.A.; Dunning, D.J.; Goulden, A.R.; Jackson, F.; Jamison, S.P.; Jones, J.K.; Marinov, K.B.; McIntosh, P.A.; McKenzie, J.W.; Militsyn, B.L.; Moss, A.J.; Muratori, B.D.; Pattalwar, S.M.; Poole, M.W.; Thompson, N.R.; Smith, R.J.; Smith, S.L.; Williams, P.H.; Bliss, N.; Bowler, M.A.; Diakun, G.P.; Fell, B.D.; Roper, M.D.; Collier, J.L.; Froud, C.A.; Hirst, G.J.; Springate, E.L.; Marangos, J.P.; Tisch, J.W.G.; McNeil, B.W.J. A Proposed New Light Source Facility for the UK.Proceedings of the 2009 Particle Accelerator Conference, Vancouver, BC, Canada, May 4–8, 2009, p 1141