Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference4 articles.
1. Transmission of information by extraterrestrial civilizations;Kardashev;Astrononicheskii Zh.,1964
2. A formulation for the number of communicative civilizations in the Galaxy;Kreifeldt;Icarus,1971
3. Intelligent Life in the Universe;Shklovskii,1966
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35 articles.
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