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2. Briggs, William M. 2008. “Michael Crichton and SETI,” online at
http://wmbriggs.com/blog/?p=249
3. Brin, David. 1983. “The ‘Great Silence’: The Controversy Concerning Extraterrestrial Intelligent Life,” QJRAS, 24, 283–309.
4. Burchell, Mark J. 2006. “W(h)ither the Drake Equation,” IJA, 5, 243–250.
5. Cameron, A. G. W. 1963a. Interstellar Communication. New York, W. A. Benjamin.