LIPPMANN, R. P. Speech recognition by machine and humans. Speech Communication. 1997, 22, 1-15
中川聖一. 情報理論の基礎と応用. 1992
中川聖一. 統計的言言語モデルの可能性と限界. 日本音響学会講演論文集. 1998, 1-6-11
NAKAGAWA, S. Relationship among perplexity word accuracy and phoneme accuracy, and drawback and modification of perplexity. Proc. First Int. Workshop East Asian Language Resources and Evaluation. 1998, 123-128