1. Walker, J.: HotBits: genuine random numbers, generated by radioactive decay. online at www.fourmilab.ch/hotbits (2001)
2. Jun, B., Kocher, P.: The intel random number generator. White Paper Prepared for Intel Corporation, Cryptography Research Inc. online at http://www.cryptography.com/resources/whitepapers/IntelRNG.pdf (1999)
3. Cret, O., Gyorfi, T., Suciu, A.: Implementing true random number generators based on high fanout nets. Roman. J. Info. Sci. Technol. 15(3), 277–298 (2012)
4. R.B.P. Dept. The Evaluation of Randomness of RPG100 by Using NIST and DIEHARD Tests. Technical report, FDK Corporation (2003)
5. Cicek, I., Pusane, A.E., Dundar, G.: A novel design method for discrete time chaos based true random number generators. Integr. VLSI J. 47(1), 38–47 (2014)