To cite biwavelet in publications use:

Gouhier, T. (2014). biwavelet: Conduct univariate and bivariate wavelet analyses (Version 0.14). Available from http://biwavelet.r-forge.r-project.org

Corresponding BibTeX entry:

  @Manual{,
    title = {biwavelet: Conduct univariate and bivariate wavelet
      analyses},
    author = {Tarik Gouhier},
    year = {2014},
    note = {(Version 0.17.2)},
    url = {http://biwavelet.r-forge.r-project.org},
  }