@misc{indiciaed5c7c65f2734,
  title = {Variational learning in nonlinear gaussian belief networks.},
  author = {B J Frey and G E Hinton},
  year = {1999},
  doi = {10.1162/089976699300016872},
  url = {https://pubmed.ncbi.nlm.nih.gov/9950729/},
  note = {Source identifier: 9950729}
}