To cite package ‘mrtsSphere’ in publications use:

  Huang H, Huang H, Ing C (2026). _mrtsSphere: Multi-Resolution
  Thin-Plate Splines on the Sphere_. R package version 0.2.0,
  <https://github.com/stlabtw/multi-resolution-sphere>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {mrtsSphere: Multi-Resolution Thin-Plate Splines on the Sphere},
    author = {Hao-Yun Huang and Hsin-Cheng Huang and Ching-Kang Ing},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://github.com/stlabtw/multi-resolution-sphere},
  }