1. The optical design of the soft x-ray self seeding at LCLS;Cocco,2013
2. https://lcls.slac.stanford.edu/instruments/l2si
3. Pencil Beam interferometer for aspheric optical surfaces;Von Bieren,1982
4. Design Of A Long Trace Surface Profiler;Takacs,1987
5. Development of multi-beam long trace profiler;Kilaru,2011