@misc{indiciae27f14853233c,
  title = {A new model for discrete character evolution.},
  author = {A Grafen and M Ridley},
  year = {1997},
  doi = {10.1006/jtbi.1996.0269},
  url = {https://pubmed.ncbi.nlm.nih.gov/9039396/},
  note = {Source identifier: 9039396}
}