1. Earth's seven sisters
2. Pulsed Plasma Thruster
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4. NASA, Pulsed Plasma Thruster, https://www.nasa.gov/centers/glenn/about/fs23grc.html (Accessed 28 February 2020).
5. P. V. Shaw, “Pulsed plasma thrusters for small satellites,” Ph.D. thesis, University of Surrey, 2011.