To cite 'xiacf' in publications use: For the theoretical background and applications of the xi-ACF framework, please also cite:

Watanabe Y (2026). xiacf: Nonlinear Dependence and Lead-Lag Analysis via Chatterjee's Xi. doi:10.5281/zenodo.19247735. R package version 0.5.0, https://github.com/yetanothersu/xiacf.

Watanabe Y (2026). “The U-Shaped Evolution of Bitcoin Efficiency.” mimeo.

Corresponding BibTeX entries:

  @Manual{,
    title = {xiacf: Nonlinear Dependence and Lead-Lag Analysis via
      Chatterjee's Xi},
    author = {Yasunori Watanabe},
    year = {2026},
    note = {R package version 0.5.0},
    url = {https://github.com/yetanothersu/xiacf},
    doi = {10.5281/zenodo.19247735},
  }

  @Unpublished{,
    title = {The U-Shaped Evolution of Bitcoin Efficiency},
    author = {Yasunori Watanabe},
    year = {2026},
    note = {mimeo},
  }