To cite the psica package in publications use:

Sysoev O, Bartoszek K, Ekstrom E, Selling KE (2019). “PSICA: decision trees for probabilistic subgroup identification with categorical treatments.” Statistics in Medicine, 38, 4436-4452.

Corresponding BibTeX entry:

  @Article{,
    author = {Oleg Sysoev and Krzysztof Bartoszek and Eva-Charlotta
      Ekstrom and Katarina Ekholm Selling},
    title = {PSICA: decision trees for probabilistic subgroup
      identification with categorical treatments},
    year = {2019},
    volume = {38},
    pages = {4436-4452},
    journal = {Statistics in Medicine},
  }