To cite the 'copynumber' package in publications use:

  Gro Nilsen, Knut Liestol and Ole Christian Lingjaerde (). copynumber:
  Segmentation of single- and multi-track copy number data by penalized
  least squares regression. R package version 1.29.0.9000.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {copynumber: Segmentation of single- and multi-track copy number data by
        penalized least squares regression},
    author = {Gro Nilsen and Knut Liestol and Ole Christian Lingjaerde},
    note = {R package version 1.29.0.9000},
  }

  Nilsen, G. & Liestol, K. et al. (2012) Copynumber: Efficient
  algorithms for single- and multi-track copy number segmentation. BMC
  Genomics 13(1):591

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Copynumber: Efficient algorithms for single- and multi-track copy number segmentation.},
    author = {G. Nilsen and K. Liestol and P. {Van Loo} and H.K.M. Vollan and M.B. Eide and O. Rueda and S.F. Chin and R. Russell and L.O. Baumbusch and C. Caldas and A.L. Borresen-Dale and O.C. Lingjaerde},
    journal = {BMC Genomics},
    volume = {13},
    number = {1},
    year = {2012},
    pages = {591},
  }