@article{WichitsaNguanLaeuterLiero2016,
  author    = {Korakot Wichitsa-Nguan and Henning L{\"a}uter and Hannelore Liero},
  title     = {Estimability in Cox models},
  journal   = {Statistical Papers},
  volume    = {57},
  pages     = {1121 -- 1140},
  doi       = {10.1007/s00362-016-0755-x},
  year      = {2016},
}