1. Technology maturation process: The NASA strategic astrophysics technology (SAT) program;Perez,2014
2. NASA, “PCOS Program Annual Technology Report,” October 1, 2017, available at https://apd440.gsfc.nasa.gov/technology/index.html
3. NASA, “COR Program Annual Technology Report,” October 1, 2017, available at https://apd440.gsfc.nasa.gov/technology/index.html
4. NASA Systems Engineering Processes and Requirements (NPR 7123.1B), Appendix E (Technology Readiness Level) available at https://nodis3.gsfc.nasa.gov/displayDir.cfm?Internal_ID=N_PR_7123_001B_&page_name=AppendixE