1. The Integration of Time Division Speech Scrambling into Police Telecommunication Networks;Bäschlin,1977
2. Speech signal privacy system based on time manipulation;Belland,1978
3. Speech perception under conditions of spectral transformation: I. Phonetic characteristics;Blesser;J. Speech and Hearing,1972
4. Efficient scrambling techniques for speech signals;Brunner,1980
5. Speech Security Systems — Today and Tomorrow;Brunner;Telecommunications,1980