To cite in publications use:

  Gouhier, T.C., and F. Guichard. 2014. Synchrony: quantifying
  variability in space and time. Methods in Ecology and Evolution
  5:524-533

A BibTeX entry for LaTeX users is

  @Article{gouhier_guichard_14,
    title = {Synchrony: quantifying variability in space and time},
    author = {Gouhier T.C and Guichard F.},
    address = {tarik.gouhier@gmail.com},
    year = {2014},
    volume = {5},
    pages = {524--533},
    journal = {Methods in Ecology and Evolution},
    url = {http://synchrony.r-forge.r-project.org},
    note = {R package version 0.3.9},
  }

Please cite this package if you use it for data analysis.