To cite sundialr in publications use:

Nayak S (2023). “The sundialr package: An Interface to 'SUNDIALS' Ordinary Differential Equation (ODE) Solvers.” doi:10.5281/zenodo.5501631, https://github.com/sn248/sundialr/.

Corresponding BibTeX entry:

  @Misc{,
    title = {The sundialr package: An Interface to 'SUNDIALS' Ordinary
      Differential Equation (ODE) Solvers},
    year = {2023},
    author = {Satyaprakash Nayak},
    doi = {10.5281/zenodo.5501631},
    url = {https://github.com/sn248/sundialr/},
  }