To cite coga in publications use:

Hu C, Pozdnyakov V, Yan J (2021). coga: Convolution of Gamma Distributions. R package version 1.1.1, https://github.com/ChaoranHu/coga.

Hu C, Pozdnyakov V, Yan J (2020). “Density and Distribution Evaluation for Convolution of Independent Gamma Variables.” Computational Statistics, 35, 327-342. doi: 10.1007/s00180-019-00924-9.

Corresponding BibTeX entries:

  @Manual{,
    title = {{coga}: Convolution of Gamma Distributions},
    author = {Chaoran Hu and Vladimir Pozdnyakov and Jun Yan},
    note = {R package version 1.1.1},
    year = {2021},
    url = {https://github.com/ChaoranHu/coga},
  }

  @Article{,
    title = {Density and Distribution Evaluation for Convolution of
      Independent Gamma Variables},
    author = {Chaoran Hu and Vladimir Pozdnyakov and Jun Yan},
    journal = {Computational Statistics},
    year = {2020},
    volume = {35},
    pages = {327-342},
    doi = {10.1007/s00180-019-00924-9},
  }