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Language Author Title ISBN Year of Publication Keywords
EN Patrick Radden Keefe Chatter - Uncovering the Echelon Surveillance Network and the secret world of global eavesdropping 0-8129-6827-1 2006
EN John Wingfield Bugging - A Complete Survey Of Electronic Surveillancy Today 1984 0-7090-1742-1
DE Manfred Fink Lauschziel Wirtschaft: Abhörgefahren und -techniken Vorbeugung und Abwehr 1996 3-415-02194-7