If you use the fhe package, please cite it in publications using:

  L. J. M. Aslett, P. M. Esperança, and C. C. Holmes (2015). A review
  of homomorphic encryption and software tools for encrypted
  statistical machine learning. Technical report, University of Oxford.

A BibTeX entry for LaTeX users is

  @Misc{,
    author = {L. J. M. Aslett and P. M. Esperan{\c c}a and C. C. Holmes},
    title = {A review of homomorphic encryption and software tools for encrypted statistical machine learning},
    year = {2015},
    note = {Technical report, University of Oxford},
    url = {https://arxiv.org/abs/1508.06574},
  }