To cite SDD in publications use:

Luca Bagnato, Lucio De Capitani, Angelo Mazza, Antonio Punzo (2015). SDD: An R Package for Serial Dependence Diagrams. Journal of Statistical Software, 64(2), 1-19. URL http://www.jstatsoft.org/v64/c02/.

Corresponding BibTeX entry:

  @Article{,
    title = {{SDD}: An {R} Package for Serial Dependence Diagrams},
    author = {Luca Bagnato and Lucio {De Capitani} and Angelo Mazza and
      Antonio Punzo},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {64},
    number = {2},
    pages = {1--19},
    url = {http://www.jstatsoft.org/v64/c02/},
  }