To cite segmented in publications use:

Muggeo VM (2003). “Estimating regression models with unknown break-points.” Statistics in Medicine, 22, 3055–3071.

Muggeo VM (2008). “segmented: an R Package to Fit Regression Models with Broken-Line Relationships.” R News, 8(1), 20–25. https://cran.r-project.org/doc/Rnews/.

Muggeo VM (2016). “Testing with a nuisance parameter present only under the alternative: a score-based approach with application to segmented modelling.” J of Statistical Computation and Simulation, 86, 3059-3067.

Muggeo VM (2017). “Interval estimation for the breakpoint in segmented regression: a smoothed score-based approach.” Australian & New Zealand Journal of Statistics, 59, 311-322.

Corresponding BibTeX entries:

  @Article{,
    title = {Estimating regression models with unknown break-points.},
    author = {Vito M.R. Muggeo},
    journal = {Statistics in Medicine},
    year = {2003},
    volume = {22},
    pages = {3055--3071},
  }

  @Article{,
    title = {segmented: an R Package to Fit Regression Models with
      Broken-Line Relationships.},
    author = {Vito M.R. Muggeo},
    journal = {R News},
    year = {2008},
    volume = {8},
    number = {1},
    pages = {20--25},
    url = {https://cran.r-project.org/doc/Rnews/},
  }

  @Article{,
    title = {Testing with a nuisance parameter present only under the
      alternative: a score-based approach with application to segmented
      modelling.},
    author = {Vito M.R. Muggeo},
    journal = {J of Statistical Computation and Simulation},
    year = {2016},
    volume = {86},
    pages = {3059-3067},
  }

  @Article{,
    title = {Interval estimation for the breakpoint in segmented
      regression: a smoothed score-based approach.},
    author = {Vito M.R. Muggeo},
    journal = {Australian & New Zealand Journal of Statistics},
    year = {2017},
    volume = {59},
    pages = {311-322},
  }