Klaus Schmeh: The East German Encryption Machine T-310 and the Algorithm It Used (angol nyelven) (pdf). Cryptologia, Volume 30, Issue 3, 2006. Taylor & Francis, 2006. szeptember 21. (Hozzáférés: 2014) „The T-310 was based on a U880 processor and it encrypted 5 bit words as used by the teleprinters of the time.”
