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2. Mukund R. Patel. Spacecraft Power Systems. CRC, November 2004.
3. A. K. Hyder. A century of aerospace electrical power technology, 2003.
4. Albert Einstein. Title translated: “On a heuristic viewpoint concerning the production and transformation of light”, 1905.
5. Paul Dickson. Sputnik: The Shock of the Century. Walker & Co., 2007.