Please cite both the package and the original articles in your
publications:

  Gruson H (????). “asymptor: Estimate the lower and upper bound of
  asymptomatic cases in an epidemic using the capture/recapture
  methods.” R package version 1.1.0.9000,
  <https://CRAN.R-project.org/package=asymptor>.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {{asymptor}: Estimate the lower and upper bound of asymptomatic
  cases in an epidemic using the capture/recapture methods},
    author = {Hugo Gruson},
    note = {R package version 1.1.0.9000},
    url = {https://CRAN.R-project.org/package=asymptor},
  }

  Böhning D, Rocchetti I, Maruotti A, Holling H (2020). “Estimating the
  undetected infections in the Covid-19 outbreak by harnessing
  capture–recapture methods.” _International Journal of Infectious
  Diseases_, *97*, 197-201. doi:10.1016/j.ijid.2020.06.009
  <https://doi.org/10.1016/j.ijid.2020.06.009>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Estimating the undetected infections in the Covid-19 outbreak by
  harnessing capture–recapture methods},
    author = {D. Böhning and I. Rocchetti and A. Maruotti and H. Holling},
    journal = {International Journal of Infectious Diseases},
    year = {2020},
    volume = {97},
    pages = {197--201},
    doi = {10.1016/j.ijid.2020.06.009},
  }

  Rocchetti I, Böhning D, Holling H, Maruotti A (2020). “Estimating the
  size of undetected cases of the SARS-CoV-2 outbreak in Europe: An
  upperbound estimator.” _medRxiv_. doi:10.1101/2020.07.14.20153445
  <https://doi.org/10.1101/2020.07.14.20153445>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Estimating the size of undetected cases of the SARS-CoV-2 outbreak
  in Europe: An upperbound estimator},
    author = {I. Rocchetti and D. Böhning and H. Holling and A. Maruotti},
    journal = {medRxiv},
    year = {2020},
    doi = {10.1101/2020.07.14.20153445},
  }