An Empirical Study of Non-Stationary Ngram Model and its Smoothing Techniques Jinghui Xiao author Bingquan Liu author Xiaolong Wang author 2007-06 text International Journal of Computational Linguistics & Chinese Language Processing, Volume 12, Number 2, June 2007 conference publication xiao-etal-2007-empirical https://aclanthology.org/O07-4002/ 2007-06 127 154