Sequential Labeling with Latent Variables: An Exact Inference Algorithm and its Efficient Approximation Xu Sun author Jun’ichi Tsujii author 2009-03 text Proceedings of the 12th Conference of the European Chapter of the ACL (EACL 2009) Alex Lascarides editor Claire Gardent editor Joakim Nivre editor Association for Computational Linguistics Athens, Greece conference publication sun-tsujii-2009-sequential https://aclanthology.org/E09-1088/ 2009-03 772 780