To cite PhysioWearable and the GGIR methodology it implements:

  Matsui Y (2026). _PhysioWearable: Free-Living Wearable Accelerometry
  for the Physio Ecosystem_. R package version 0.1.0,
  <https://github.com/x-biosignal/PhysioWearable>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PhysioWearable: Free-Living Wearable Accelerometry for the Physio Ecosystem},
    author = {Yusuke Matsui},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/x-biosignal/PhysioWearable},
  }

  van Hees V (2013). “Estimation of Daily Energy Expenditure in
  Pregnant and Non-Pregnant Women Using a Wrist-Worn Tri-Axial
  Accelerometer.” _PLoS ONE_, *8*(4), e61691.
  doi:10.1371/journal.pone.0061691
  <https://doi.org/10.1371/journal.pone.0061691>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Estimation of Daily Energy Expenditure in Pregnant and Non-Pregnant Women Using a Wrist-Worn Tri-Axial Accelerometer},
    author = {Vincent T. {van Hees}},
    journal = {PLoS ONE},
    year = {2013},
    volume = {8},
    number = {4},
    pages = {e61691},
    doi = {10.1371/journal.pone.0061691},
  }

  van Hees V (2014). “Autocalibration of accelerometer data for
  free-living physical activity assessment using local gravity and
  temperature.” _Journal of Applied Physiology_, *117*(7), 738-744.
  doi:10.1152/japplphysiol.00421.2014
  <https://doi.org/10.1152/japplphysiol.00421.2014>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Autocalibration of accelerometer data for free-living physical activity assessment using local gravity and temperature},
    author = {Vincent T. {van Hees}},
    journal = {Journal of Applied Physiology},
    year = {2014},
    volume = {117},
    number = {7},
    pages = {738-744},
    doi = {10.1152/japplphysiol.00421.2014},
  }