Howard, Kez; Thomas, Jason
Starlog 3: 42-49. January 1977.
Johnson, Les; Matloff, Gregory L.
Analog 126(11): 44-53. November 2006.
Landis, Geoffrey
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 119-128.
Rees, Martin
in: Benford, James and Benford, Gregory, eds. Starship Century. Microwave Sciences, 2013. p. 17-26.
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