To cite segmented in publications use:

Vito M. R. Muggeo (2003). Estimating regression models with unknown break-points. Statistics in Medicine, 22, 3055-3071.

Vito M. R. Muggeo (2008). segmented: an R Package to Fit Regression Models with Broken-Line Relationships. R News, 8/1, 20-25. URL http://cran.r-project.org/doc/Rnews/.

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 = {http://cran.r-project.org/doc/Rnews/}, }