To cite package ‘PhysioTwin’ in publications use:

  Matsui Y (2026). _PhysioTwin: Digital-Twin Simulation and Data
  Assimilation for Physiological and Movement Systems_. R package
  version 0.1.2, <https://github.com/x-biosignal/physiotwin>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PhysioTwin: Digital-Twin Simulation and Data Assimilation for Physiological
and Movement Systems},
    author = {Yusuke Matsui},
    year = {2026},
    note = {R package version 0.1.2},
    url = {https://github.com/x-biosignal/physiotwin},
  }