To cite package ‘HhP’ in publications use:

Ren M, Zhang Q, Zhang S, Zhong T, Huang J, Ma S (2022). HhP: Hierarchical Heterogeneity Analysis via Penalization. R package version 1.0.0, https://CRAN.R-project.org/package=HhP.

Corresponding BibTeX entry:

  @Manual{,
    title = {HhP: Hierarchical Heterogeneity Analysis via
      Penalization},
    author = {Mingyang Ren and Qingzhao Zhang and Sanguo Zhang and
      Tingyan Zhong and Jian Huang and Shuangge Ma},
    year = {2022},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=HhP},
  }