@article{JMLR:v23:21-1159,
  author  = {Martin E. Jakobsen and Rajen D. Shah and Peter Bühlmann and Jonas Peters},
  title   = {Structure Learning for Directed Trees},
  journal = {Journal of Machine Learning Research},
  year    = {2022},
  volume  = {23},
  number  = {159},
  pages   = {1--97},
  url     = {http://jmlr.org/papers/v23/21-1159.html}
}