To cite the mpmaggregate package in publications:

  Hinrichsen RA, Salguero-Gomez R, Yokomizo H (2026). _mpmaggregate:
  Aggregate Matrix Population Models_. R package version 0.2.6,
  <https://CRAN.R-project.org/package=mpmaggregate>.

A BibTeX entry for LaTeX users is

  @Manual{mpmaggregate,
    title = {mpmaggregate: Aggregate Matrix Population Models},
    author = {Richard A. Hinrichsen and Roberto Salguero-Gomez and Hiroyuki Yokomizo},
    year = {2026},
    note = {R package version 0.2.6},
    url = {https://CRAN.R-project.org/package=mpmaggregate},
  }