To cite package L1pack in publications use:

Osorio F, Wolodzko T (2020). Routines for L1 estimation. R package version 0.38.196, http://l1pack.mat.utfsm.cl.

Corresponding BibTeX entry:

  @Manual{,
    title = {Routines for L1 estimation},
    author = {F. Osorio and T. Wolodzko},
    year = {2020},
    note = {R package version 0.38.196},
    url = {http://l1pack.mat.utfsm.cl},
  }