Masataka Izumi Takao Miura Isamu Shioya Entropy-Based Age Estimation of Blog Authors. 795-800 2008 COMPSAC http://doi.ieeecomputersociety.org/10.1109/COMPSAC.2008.201 conf/compsac/2008 db/conf/compsac/compsac2008.html#IzumiMS08