To cite Rmpi in a publication use:

Yu H (2002). “Rmpi: Parallel Statistical Computing in R.” R News, 2(2), 10–14. https://cran.r-project.org/doc/Rnews/Rnews_2002-2.pdf.

Corresponding BibTeX entry:

  @Article{,
    title = {Rmpi: Parallel Statistical Computing in R},
    author = {Hao Yu},
    journal = {R News},
    year = {2002},
    volume = {2},
    number = {2},
    pages = {10--14},
    url = {https://cran.r-project.org/doc/Rnews/Rnews_2002-2.pdf},
  }