Simple hardware RNGs

[John A. Thomas]

Having built devices for generating random data, I can tell you the 
problem is more difficult than it appears.  The problem is removing 
biases and correlations from the process.

A good place to start is Murry, Herschell, "A General Approach for 
Generating natural Random Variables", IEEE Transactions on Computers, 
December 1970, p. 1210-1213.

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