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- A. G. W. Cameron, Ed.,
- In- terstellar Communication
- (Benjamin, New York,1963);
- I. S. Shklovskii and C. Sagan,
- In-telligent Life in the Universe
- (Holden-Day, San Francisco, 1966);
- C. Sagan, Ed.,
- Communication with Extraterrestrial Intelligence
- (MIT Press, Cambridge, Mass., 1973);
- P. Morrison, J.
- B. M. Oliver and J. Billingham,
- "Project Cyclops: A Design Study of a System for Detecting Extraterrestrial Intelligent Life,"
- NASA Contract. Rep. CR114445 (1973).
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