To cite package ‘WPKDE’ in publications use:

  Liu X, Ye K, Wang S, Liu X, Yu T (2025). _WPKDE: Weighted Piecewise
  Kernel Density Estimation_. R package version 1.0,
  <https://CRAN.R-project.org/package=WPKDE>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {WPKDE: Weighted Piecewise Kernel Density Estimation},
    author = {Xiaotong Liu and Kunyu Ye and Siyao Wang and Xudong Liu and Tianwei Yu},
    year = {2025},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=WPKDE},
  }