On Universal Noiseless Source Coding for Infinite Source Alphabets. - László Györfi; Istvan Pali; Edward C. van der Meulen (Eur. Trans. Telecommun., 1993)

There is no universal source code for an infinite source alphabet. - László Györfi; Istvan Pali; Edward C. van der Meulen (IEEE Trans. Inf. Theory, 1994)