@article{Bacciu2012b,
  author = "D. Bacciu and A. Micheli and A. Sperduti",
  title = "Compositional Generative Mapping for Tree-Structured Data - Part I: Bottom-Up Probabilistic Modeling of Trees.",
  year = 2012,
  journal = "IEEE Transactions on Neural Networks and Learning Systems",
  volume = 23,
  pages = "1987-2002",
  doi = "10.1109/TNNLS.2012.2222044",
  url = "https://ieeexplore.ieee.org/document/6353263"
}