1. Albert Einstein, On the Ether “The Philosophy of Vacuum” ed. Saunders and Brown, Oxford, 1924.
2. Anthony J G Hey, Possible Technologies for Quantum Computers, http://www.ecs.soton.ac.uk/~quantrep.html
3. Anthony J G Hey,Possible Technologies for Quantum Computers, http://www.ecs.soton.ac.uk/~aigh/auantrep.html
4. B Schneier,Applied cryptography: Protocols, algorithms, and source code in C., John Wiley & Sons, New York 1994.
5. Bernardo Barbiellini,Quantum Computing Lectures, http://stardec.hpcc.neu.edu/~bba/RES/OCOMP/OCOMP.html