Keyser is mentioned in the BBC television mini series The State Within (Season 1, Episode 1).
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Yevgenia Albats, The State Within a State: The KGB and Its Hold on Russia—Past, Present, and Future, Farrar, Straus, Giroux, 1994, trans.
Yevgenia Albats and Catherine A. Fitzpatrick, The State Within a State: The KGB and Its Hold on Russia — Past, Present, and Future Farrar Straus Giroux (1994) ISBN 0-374-52738-5.