Latent Document Re-Ranking Dong Zhou author Vincent Wade author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication zhou-wade-2009-latent https://aclanthology.org/D09-1163/ 2009-08 1571 1580