@ARTICLE{DeBock2014JAIR,
  author = {De Bock, Jasper and De Cooman, Gert},
  title = {An Efficient Algorithm for Estimating State Sequences in Imprecise Hidden Markov Models},
  journal = {Journal of Artificial Intelligence Research},
  year = {2014},
  volume = {50},
  pages = {189-233},
  month = {May}
}