A comparison between the 19th century early proposals and the 20th–21st centuries realized projects intended to contact other planets
| Autor: | Raulin Cerceau, Florence, Bilodeau, Bénédicte |
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| Zdroj: | In Acta Astronautica September-October 2012 78:72-79 |
| Databáze: | ScienceDirect |
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Full Text from ScienceDirect