To cite isocir in publications use:

Sandra Barragan, Miguel A. Fernandez, Cristina Rueda, Shyamal Das Peddada (2013). isocir: An R Package for Constrained Inference Using Isotonic Regression for Circular Data, with an Application to Cell Biology. Journal of Statistical Software, 54(4), 1-17. URL http://www.jstatsoft.org/v54/i04/.

Corresponding BibTeX entry:

  @Article{,
    title = {{isocir}: An {R} Package for Constrained Inference Using
      Isotonic Regression for Circular Data, with an Application to
      Cell Biology},
    author = {Sandra Barrag\'{a}n and Miguel A. Fern\'{a}ndez and
      Cristina Rueda and Shyamal Das Peddada},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {54},
    number = {4},
    pages = {1--17},
    url = {http://www.jstatsoft.org/v54/i04/},
  }