1. ALS-U, https://als.lbl.gov/als-u/.
2. [ALS-U: Solving Scientific Challenges with Coherent Soft X-Rays];Kevan,2017
3. Requirements on Hard X-ray Grazing Incidence Optics for European XFEL: Analysis and Simulation of Wavefront Transformations;Samoylova,2009
4. X-ray Mirrors;Assoufid,2013
5. Specification of x-ray mirrors in terms of system performance: A new twist to an old plot;Yashchuk,2014