I added information from FMS P-038 ‘German Radio Intelligence’ and ADM 223/505 ‘Cypher security and W/T (Wireless Telegraphy) deception’ in The Slidex code.
summary of ‘British intelligence’ vol4 in ‘Book
review – British Intelligence in the Second World War’.
of Dienstelle Klatt – A case of
Soviet deception using information from ‘Foreign intelligence
literary scene’ article: The legend of Agent Max’ and ‘The Crown Jewels: The British Secrets at the Heart of the KGB