Gianfranco Cariolaro Gianfranco L. Pierobon Silvano Pupolin Spectral analysis of variable-length coded digital signals. 473-481 1982 28 IEEE Transactions on Information Theory 3 db/journals/tit/tit28.html#CariolaroPP82 http://dx.doi.org/10.1109/TIT.1982.1056517