1. Uchida, A. et al. Nature Photon. 2, 728–732 (2008).
2. von Neumann, J. J. Res. Natl Bur. Stand. Appl. Math. Ser. 12, 36–38 (1951); reprinted John von Neumann Collected Works Vol.5 (ed. Taub, A. H.) 768–770 (New York, Macmillan, 1963).
3. Dorrendorf, L., Gutterman, Z. & Pinkas, B. in Proc. 14th ACM Conf. Computer Commun. Security 476–485 (2007).
4. Galton F. Nature 42, 13–14 (1890).
5. Ford, J. Phys. Today 36, 40–47 (1983).