To cite mvGPS package in publications, please use:

  Williams, J.R., & Crespi, C.M. (2020). Causal inference for multiple
  continuous exposures via the multivariate generalized propensity
  score. arXiv:2008.13767.

A BibTeX entry for LaTeX users is

  @Misc{,
    author = {Justin R. Williams and Catherine M. Crespi},
    title = {Causal inference for multiple continuous exposures via the multivariate generalized propensity score},
    year = {2020},
    note = {arXiv:2008.13767},
  }