To cite package ‘ECG’ in publications use:

  Gasca-Aragon H (2024). _ECG: Center of Gravity Methods_. R package
  version 0.5.2, <https://CRAN.R-project.org/package=ECG>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ECG: Center of Gravity Methods},
    author = {Hugo Gasca-Aragon},
    year = {2024},
    note = {R package version 0.5.2},
    url = {https://CRAN.R-project.org/package=ECG},
  }