L. Gyorfi et al., ON UNIVERSAL NOISELESS SOURCE-CODING FOR INFINITE SOURCE ALPHABETS, European transactions on telecommunications and related technologies, 4(2), 1993, pp. 125-132
We show that there is a universal noiseless source code for the class
of all countably infinite memoryless sources for which a fixed given u
niquely decodable code has finite expected codeword length. This sourc
e code is derived from a class of distribution estimation procedures w
hich are consistent in expected information divergence.