To cite rhosp in publications use:

J. Barthes and C. Dutang (2006), rhosp: an actuary approach of risk evaluation during hospitalizations.

Corresponding BibTeX entry:

  @Manual{,
    title = {rhosp: an actuary approach of risk evaluation during
      hospitalizations.},
    author = {Julie Barth'es and Christophe Dutang},
    year = {2006},
    note = {R package version 1.05},
  }