To cite package ‘gscreend’ in publications use:

  Imkeller, K., Ambrosi, G., Boutros, M., Huber, W. gscreend: modelling
  asymmetric count ratios in CRISPR screens to decrease experiment size
  and improve phenotype detection. Genome Biology 21, 53. (2020)

A BibTeX entry for LaTeX users is

  @Article{,
    title = {gscreend: modelling asymmetric count ratios in CRISPR screens to decrease experiment size and improve phenotype detection},
    author = {Katharina Imkeller and Giulia Ambrosi and Michael Boutros and Wolfgang Huber},
    year = {2020},
    journal = {Genome Biology},
    doi = {10.1186/s13059-020-1939-1},
    volume = {21},
    issue = {53},
  }