To cite dynmix package in publications use:

  Drachal, K., 2023, ''dynmix'': An R package for the estimation of
  dynamic finite mixtures, SoftwareX 22, 101388,
  https://doi.org/10.1016/j.softx.2023.101388

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{''dynmix''}: {A}n {R} package for the estimation of dynamic finite mixtures},
    author = {Krzysztof Drachal},
    journal = {SoftwareX},
    volume = {22},
    pages = {101388},
    year = {2023},
    url = {https://doi.org/10.1016/j.softx.2023.101388},
  }