To cite L1pack in publications use:

  Osorio, F., Wolodzko, T. (2024). Routines for L1 estimation. R
  package version 0.50. URL: http://l1pack.mat.utfsm.cl

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Routines for L1 estimation},
    author = {F. Osorio and T. Wolodzko},
    year = {2024},
    note = {R package version 0.50},
    url = {http://l1pack.mat.utfsm.cl},
  }