To cite OpenCPU in publications use:

  Ooms J (2014). “The OpenCPU System: Towards a Universal Interface for
  Scientific Computing through Separation of Concerns.”
  _arXiv:1406.4806 [stat.CO]_. <https://arxiv.org/abs/1406.4806>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The OpenCPU System: Towards a Universal Interface for Scientific Computing through Separation of Concerns},
    author = {Jeroen Ooms},
    journal = {arXiv:1406.4806 [stat.CO]},
    year = {2014},
    url = {https://arxiv.org/abs/1406.4806},
  }