To cite package 'cda' in publications use:

Baptiste Auguie (2014). cda: Coupled dipole approximation of light scattering by clusters of nanoparticlesR package version 1.5.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {cda: Coupled dipole approximation of light scattering by
      clusters of nanoparticles},
    author = {Baptiste Auguie},
    year = {2014},
    note = {R package version 1.5.1},
  }