Please cite the multfisher package by the following reference (open access):

Ristl R, Xi D, Glimm E, Posch M (2018). “Optimal exact tests for multiple binary endpoints.” Computational Statistics and Data Analysis, 122, 1–17.

Corresponding BibTeX entry:

  @Article{,
    title = {Optimal exact tests for multiple binary endpoints},
    author = {Robin Ristl and Dong Xi and Ekkehard Glimm and Martin
      Posch},
    journal = {Computational Statistics and Data Analysis},
    year = {2018},
    volume = {122},
    pages = {1--17},
  }