A Regression Survival Model for Testing the Proportional Hazards Assumption. Quantin, C.; Moreau, T.; Asselain, B.; Maccaria, J.; and Lellouch, J. Biometrics, 52:874-885, 1996.
bibtex   
@article{qua96reg,
  title = {A Regression Survival Model for Testing the Proportional Hazards Assumption},
  volume = {52},
  journal = {Biometrics},
  author = {Quantin, Catherine and Moreau, Thierry and Asselain, Bernard and Maccaria, Jean and Lellouch, Joseph},
  year = {1996},
  keywords = {harrell-lee-test-of-ph,power-of-tests-of-ph,testing-ph},
  pages = {874-885},
  citeulike-article-id = {13264719},
  posted-at = {2014-07-14 14:09:40},
  priority = {0}
}
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