@ARTICLE{HeckmanHonore1989,
  author = {Heckman, James J. and Honoré, Bo E.},
  title = {The Identifiability of the Competing Risks Model},
  journal = {Biometrika},
  year = {1989},
  volume = {76},
  pages = {325--330},
  number = {2},
  abstract = {This paper considers the consequences for identifiability of introducing
    regressors into the competing risks model of multistate duration
    analysis. We establish conditions under which access to regressors
    overturns the nonidentification theorem of Cox and Tsiatis for both
    proportional and accelerated failure time models.},
  date = {June 1, 1989},
  owner = {honore},
  timestamp = {2008.12.17},
  url = {http://biomet.oxfordjournals.org/cgi/content/abstract/76/2/325}
}