1. Sutton, George P. "Rocket Propulsion Elements, An Introduction to the Engineering of Rockets," (John Wiley and Sons, Inc., copyright1949), page17. See also: Sutton, George P., and Biblarz, Oscar, "Rocket Propulsion Elements, Seventh Edition," (John Wiley and Sons, Inc., New York, copyright 2001). page 38.
2. Optimum exhaust velocity for laser-driven rockets
3. ORION: Clearing near-Earth space debris using a 20-kW, 530-nm, Earth-based, repetitively pulsed laser
4. Energy conversion in laser propulsion