M. Generet, H. Ney, and F. Wessel. Extensions of Absolute Discounting for Language Modeling. In European Conference on Speech Communication and Technology (EUROSPEECH), pages 1245-1248, Madrid, Spain, September 1995.
S. Martin, J. Liermann, and H. Ney. Algorithms for Bigram and Trigram Word Clustering. In European Conference on Speech Communication and Technology (EUROSPEECH), pages 1253-1256, Madrid, Spain, September 1995.