@misc{indiciaeb1057e0044eb,
  title = {ON SEMI-MARKOV PROCESSES.},
  author = {W Feller},
  year = {1964},
  doi = {10.1073/pnas.51.4.653},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591166/},
  note = {Source identifier: 16591166}
}