1. High-security asynchronous circuit implementation of AES
2. Delay Insensitivity Does Not Mean Slope Insensitivity!
3. Kishinevsky, M., Kondratyev, A., Taubin, A., and Varshavsky, V.: ‘Concurrent hardware: the theory and practice of self-timed design’, (John Wiley 1993), p. 328
4. http://www.lsi.upc.edu/~jordicf/petrify/