To cite package ‘gpuMagic’ in publications use:

  Wang J, Morgan M (2018). _gpuMagic: An openCL compiler with the
  capacity to compile R functions and run the code on GPU_. R package
  version 1.21.0, <https://bioconductor.org/packages/gpuMagic>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gpuMagic: An openCL compiler with the capacity to compile R functions and
run the code on GPU},
    author = {Jiefei Wang and Martin Morgan},
    year = {2018},
    note = {R package version 1.21.0},
    url = {https://bioconductor.org/packages/gpuMagic},
  }