@inproceedings{Pletscher:SpanningCRF:2009,
  author    = {Pletscher, Patrick and Ong, Cheng Soon and
               Buhmann, Joachim M.},
  title     = {Spanning Tree Approximations for Conditional Random Fields},
  booktitle = {Proceedings of the Twelfth International Conference on
               Artificial Intelligence and Statistics ({AISTATS})},
  year      = {2009},
}