To cite MortalitySmooth in publications use:

Carlo G. Camarda (2012). MortalitySmooth: An R Package for Smoothing Poisson Counts with P-Splines. Journal of Statistical Software, 50(1), 1-24. URL http://www.jstatsoft.org/v50/i01/.

Corresponding BibTeX entry:

  @Article{,
    title = {{MortalitySmooth}: An {R} Package for Smoothing {P}oisson
      Counts with {P}-Splines},
    author = {Carlo G. Camarda},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {50},
    number = {1},
    pages = {1--24},
    url = {http://www.jstatsoft.org/v50/i01/},
  }