To cite IsoSpecR in publications use:

Mateusz K. Łącki, Michał Startek, Dirk Valkenborg, Anna Gambin (2017). IsoSpec: Hyperfast Fine Structure Calculator. Analytical Chemistry 89(6), 3272-3277. URL https://doi.org/10.1021/acs.analchem.6b01459

Corresponding BibTeX entry:

  @Article{,
    title = {{IsoSpec}: Hyperfast Fine Structure Calculator},
    author = {Mateusz K. Łącki and Michał Startek and Dirk Valkenborg
      and Anna Gambin},
    journal = {Analytical Chemistry},
    year = {2017},
    volume = {89},
    number = {6},
    pages = {3272-3277},
    url = {https://doi.org/10.1021/acs.analchem.6b01459},
  }