1. “The Chandra Proposers’ Observatory Guide”, Version 25.0, December 2022 (Prepared by: Chandra X-ray Center Chandra Project Science, MSFC Chandra IPI Teams).
2. “XMM-Newton Users Handbook”, Issue 2.21, 17.07.2023 (ESA: XMM-Newton SOC).
3. NewATHENA Optics Technology;Bavdaz,2023
4. “Lynx Concept Study Report”, https://www.lynxobservatory.com/report
5. The Generation-X Vision Mission Study and Advanced Mission Concept;Brissenden;AAS/High Energy Astrophysics Division# 10,2008