Allignol A, Schumacher M, Beyersmann J (2011). “Empirical Transition Matrix of Multi-State Models: The etm Package.” Journal of Statistical Software, 38(4), 1–15. doi:10.18637/jss.v038.i04. https://www.jstatsoft.org/v38/i04/.

Corresponding BibTeX entry:

  @Article{,
    title = {Empirical Transition Matrix of Multi-State Models: The
      {etm} Package},
    author = {Arthur Allignol and Martin Schumacher and Jan
      Beyersmann},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {38},
    number = {4},
    pages = {1--15},
    url = {https://www.jstatsoft.org/v38/i04/},
    doi = {10.18637/jss.v038.i04},
  }