@inproceedings{analgorithmtolearnpolytreenetworkswith,
  title = {An Algorithm to Learn Polytree Networks with Hidden Nodes},
  author = {Firoozeh Sepehr and Donatello Materassi},
  year = {2019},
  booktitle = {NeurIPS 2019 12},
  url = {http://papers.nips.cc/paper/9647-an-algorithm-to-learn-polytree-networks-with-hidden-nodes},
}