To cite package ‘circtree’ in publications use:

  Lang M, Schlosser L, Zeileis A (2024). _circtree: Regression Trees
  and Forests for Circular Responses_. R package version 0.1-0,
  <https://r-forge.r-project.org/projects/partykit>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {circtree: Regression Trees and Forests for Circular Responses},
    author = {Moritz N. Lang and Lisa Schlosser and Achim Zeileis},
    year = {2024},
    note = {R package version 0.1-0},
    url = {https://r-forge.r-project.org/projects/partykit},
  }