To cite package ‘spef’ in publications use:

  Chiou S, Wang X, Yan J (2026). _spef: Semiparametric Estimating
  Functions_. R package version 1.0.9,
  <https://github.com/stc04003/spef>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {spef: Semiparametric Estimating Functions},
    author = {Sy Han (Steven) Chiou and Xiaojing Wang and Jun Yan},
    year = {2026},
    note = {R package version 1.0.9},
    url = {https://github.com/stc04003/spef},
  }