To cite IPCAPS in publications use:

Chaichoompu K, Abegaz F, Tongsima S, Shaw PJ, Sakuntabhai A, Pereira L, Van Steen K (2018). IPCAPS: Iterative Pruning to Capture Population Structure. R package version 1.1.8, https://CRAN.R-project.org/package=IPCAPS.

Corresponding BibTeX entry:

  @Manual{,
    title = {IPCAPS: Iterative Pruning to Capture Population
      Structure},
    author = {Kridsadakorn Chaichoompu and Fentaw Abegaz and Sissades
      Tongsima and Philip James Shaw and Anavaj Sakuntabhai and Luisa
      Pereira and Kristel {Van Steen}},
    year = {2018},
    note = {R package version 1.1.8},
    url = {https://CRAN.R-project.org/package=IPCAPS},
  }