Nikolaj Semjonovič Kardašov (Czech Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nikolaj Semjonovič Kardašov" in Czech language version.

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1web.archive.org

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harvard.edu

adsabs.harvard.edu

KARDASHEV, Nikolai. Transmission of Information by Extraterrestrial Civilizations. Soviet Astronomy. 1964, s. 217. Bibcode 1964SvA.....8..217K.

web.archive.org

Velká ruská encyklopedie [online]. Ruská akademie věd [cit. 2019-08-06]. Heslo КАРДАШЁВ. Dostupné v archivu pořízeném dne 2019-08-04. (rusky)

zioc.ru

Full Member of RAS Oleg Nefedov was awarded the Demidov Prize [online]. Royal Academy of Sciences [cit. 2015-09-11]. Dostupné online.