1. Cosmic Milestone: NASA Confirms 5,000 Exoplanets,2022
2. SETI and SEH (statistical equation for habitables);Maccone;Acta Astronaut.,2011
3. Limits of interstellar flight technology;Frisbee,2009
4. The Starflight Handbook: A Pioneer’s Guide to Interstellar Travel;Mallove,1989
5. Elementary Modern Physics;Weidner,1980