A Jackknife Estimator of Variance for Cox Regression for Correlated Survival Data. Lipsitz, S. R. & Parzen, M. Biometrics, 52:291-298, 1996.
bibtex   
@article{lip96jac,
  title = {A Jackknife Estimator of Variance for {{Cox}} Regression for Correlated Survival Data},
  volume = {52},
  journal = {Biometrics},
  author = {Lipsitz, Stuart R. and Parzen, Michael},
  year = {1996},
  keywords = {cluster-sampling,jackknife,robust-covariance-estimator},
  pages = {291-298},
  citeulike-article-id = {13264532},
  posted-at = {2014-07-14 14:09:37},
  priority = {0}
}

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