author= {Martin, S. and Liermann, J. and Ney, H.},
title= {Automatic Bigram and Trigram Clustering for Word Classes},
journal= {Speech Communication},
pages= {19-37},
volume= {24},
number= {1},
year= 1998,
month= apr,
journallink= {https://www.sciencedirect.com},
url = {http://https://www.sciencedirect.com/science/article/abs/pii/S0167639397000629}