↑ Grayzeck, Dr. Edwin J. "Voskhod 2". nssdc.gsfc.nasa.gov. National Space Science Data Center. Archived from the original on 14 May 2021. Retrieved 20 July 2014.
↑ Lindy, Jacob D. (2001). Beyond invisible walls: the psychological legacy of Soviet trauma, East European therapists and their patients. New York: Brunner-Routledge. p.192. ISBN9781583913185.
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