@InProceedings{johnson:2007:EMNLP-CoNLL2007,
  author    = {Johnson, Mark},
  title     = {Why Doesn't {EM} Find Good {HMM} {POS}-Taggers?},
  booktitle = {Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning (EMNLP-CoNLL)},
  pages     = {296--305},
  url       = {http://www.aclweb.org/anthology/D/D07/D07-1031}
}