en.wikipedia.org
en.wikipedia.org
britannica.com
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collectspace.com
fai.org
World Air Sports Federation
https://www.fai.org › news › 50-years-later-bykovskys-record-longest-solo-flight-spacecraft-still-intact
astronautix.com
Encyclopedia Astronautica
www.astronautix.com › b › bykovsky.html
bbc.co.uk
spacefacts.de
telegraph.co.uk
simple.wikipedia.org
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