To cite dcemriS4 in publications use:

Brandon Whitcher, Volker J. Schmid (2011). Quantitative Analysis of Dynamic Contrast-Enhanced and Diffusion-Weighted Magnetic Resonance Imaging for Oncology in R. Journal of Statistical Software, 44(5), 1-29. URL http://www.jstatsoft.org/v44/i05/.

Corresponding BibTeX entry:

  @Article{,
    title = {Quantitative Analysis of Dynamic Contrast-Enhanced and
      Diffusion-Weighted Magnetic Resonance Imaging for Oncology in
      {R}},
    author = {Brandon Whitcher and Volker J. Schmid},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {44},
    number = {5},
    pages = {1--29},
    url = {http://www.jstatsoft.org/v44/i05/},
  }