Benjamin Snyder Tahira Naseem Jacob Eisenstein Regina Barzilay Unsupervised Multilingual Learning for POS Tagging. 1041-1050 2008 EMNLP http://www.aclweb.org/anthology/D08-1109 conf/emnlp/2008 db/conf/emnlp/emnlp2008.html#SnyderNEB08