To cite package ‘DDRTree’ in publications use:

  Qiu X, Trapnell C, Mao Q, Wang L (2026). _DDRTree: Learning Principal
  Graphs with DDRTree_. R package version 0.1.6,
  <https://CRAN.R-project.org/package=DDRTree>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {DDRTree: Learning Principal Graphs with DDRTree},
    author = {Xiaojie Qiu and Cole Trapnell and Qi Mao and Li Wang},
    year = {2026},
    note = {R package version 0.1.6},
    url = {https://CRAN.R-project.org/package=DDRTree},
  }