@article{ancoliisrael1997-9130329,
  author  = {Ancoli-Israel, S. and Klauber, M. R. and Jones, D. W. and Kripke, D. F. and Martin, J. and Mason, W. and Pat-Horenczyk, R. and Fell, R.},
  title   = {{Variations in circadian rhythms of activity, sleep, and light exposure related to dementia in nursing-home patients}},
  journal = {Sleep},
  year    = {1997},
  doi     = {10.1093/sleep/20.1.18},
  pmid    = {9130329},
  url     = {https://doi.org/10.1093/sleep/20.1.18}
}