To cite MPCR in publications:

  Mary Lai O. Salvana, Sameh Abdulah, Minwoo Kim, David Helmy, Ying Sun
  & Marc G. Genton (2024). MPCR: Multi-and Mixed-Precision Computations
  Package in R. arXiv preprint, arXiv:2406.02701.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {MPCR: Multi-and Mixed-Precision Computations Package in R},
    author = {Mary Lai O. Salvana and Sameh Abdulah and Minwoo Kim and David Helmy and Ying Sun and Marc G. Genton},
    journal = {arXiv preprint},
    note = {arXiv:2406.02701},
    year = {2024},
  }

Please cite the article above. If appropriate.