To cite coalitions in publications sue:

Bender et al., (2018). coalitions: Coalition probabilities in multi-party democracies. Journal of Open Source Software, 3(23), 606, https://doi.org/10.21105/joss.00606

Corresponding BibTeX entry:

  @Article{,
    title = {coalitions: Coalition probabilities in multi-party
      democracies},
    author = {Andreas Bender and Alexander Bauer},
    journal = {The Journal of Open Source Software},
    year = {2018},
    month = {mar},
    volume = {3},
    number = {23},
    url = {http://joss.theoj.org/papers/10.21105/joss.00606},
    doi = {10.21105/joss.00606},
  }