To cite snvecR in publications use:

Kocken I, Zeebe R (2023). snvecR: Calculate Earth’s Obliquity and Precession in the Past. doi:10.5281/zenodo.7865279, https://japhir.github.io/snvecR/.

Corresponding BibTeX entry:

  @Manual{KockenZeebe2023,
    title = {snvecR: Calculate Earth’s Obliquity and Precession in the
      Past},
    author = {Ilja Kocken and Richard Zeebe},
    year = {2023},
    abstract = {Easily calculate precession and obliquity from an
      astronomical solution (defaults to ZB18a from Zeebe and Lourens
      (2019)) and assumed or reconstructed values for tidal dissipation
      (Td) and dynamical ellipticity (Ed). This is a translation and
      adaptation of the C-code in the supplementary material to Zeebe
      and Lourens (2022), with further details on the methodology
      described in Zeebe (2022). The name of the C-routine is snvec,
      which refers to the key units of computation: spin vector s and
      orbit normal vector n.},
    version = {3.9.2},
    doi = {10.5281/zenodo.7865279},
    url = {https://japhir.github.io/snvecR/},
  }