To cite package ‘flex’ in publications use:

Lee C (2025). flex: Fuzzy Linear Squares Estimation with Explicit Formula (FLEX). R package version 0.1.0, https://CRAN.R-project.org/package=flex.

Corresponding BibTeX entry:

  @Manual{,
    title = {flex: Fuzzy Linear Squares Estimation with Explicit
      Formula (FLEX)},
    author = {Chaewon Lee},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=flex},
  }