@misc{indiciaef321ddf92341,
  title = {[Approximation of sleep duration and sleep efficiency using actography].},
  author = {F Wallner and J Backhaus and F Hohagen and D Riemann},
  year = {1995},
  url = {https://pubmed.ncbi.nlm.nih.gov/8588383/},
  note = {Source identifier: 8588383}
}