To cite package ‘GARS’ in publications use:

  Mattia Chiesa, Giada Maioli, Gualtiero I. Colombo and Luca
  Piacentini. GARS: Genetic Algorithm for the identification of a
  Robust Subset of features in high-dimensional datasets BMC
  bioinformatics, (2020)., https://doi.org/10.1186/s12859-020-3400-6

A BibTeX entry for LaTeX users is

  @Article{,
    title = {GARS: Genetic Algorithm for the identification 
		 of a Robust Subset of features in high-dimensional datasets},
    author = {Mattia Chiesa and Giada Maioli and Gualtiero I. Colombo and Luca Piacentini},
    journal = {BMC bioinformatics},
    volume = {21},
    number = {1},
    pages = {54},
    year = {2020},
    doi = {10.1186/s12859-020-3400-6},
  }