Marco Bucci Lucia Germani Raimondo Luzzi Alessandro Trifiletti Mario Varanonuovo A High-Speed Oscillator-Based Truly Random Number Source for Cryptographic Applications on a Smart Card IC. 403-409 2003 52 IEEE Trans. Computers 4 http://doi.ieeecomputersociety.org/10.1109/TC.2003.1190581 db/journals/tc/tc52.html#BucciGLTV03