To cite package ‘deFit’ in publications use:

  Hu Y, Liu Q, Li M (2024). _deFit: Fitting Differential Equations to
  Time Series Data_. R package version 0.3.0,
  <https://CRAN.R-project.org/package=deFit>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {deFit: Fitting Differential Equations to Time Series Data},
    author = {Yueqin Hu and Qingshan Liu and Minglan Li},
    year = {2024},
    note = {R package version 0.3.0},
    url = {https://CRAN.R-project.org/package=deFit},
  }