To cite package 'qualV' in publications use:

Stefanie Jachner, K. Gerald van den Boogaart, Thomas Petzoldt (2007). “Statistical Methods for the Qualitative Assessment of Dynamic Models with Time Delay (R Package qualV).” Journal of Statistical Software, 22(8), 1–30. doi:10.18637/jss.v022.i08.

Corresponding BibTeX entry:

  @Article{,
    title = {Statistical Methods for the Qualitative Assessment of
      Dynamic Models with Time Delay (R Package qualV)},
    author = {{Stefanie Jachner} and {K. Gerald van den Boogaart} and
      {Thomas Petzoldt}},
    journal = {Journal of Statistical Software},
    volume = {22},
    number = {8},
    pages = {1--30},
    year = {2007},
    doi = {10.18637/jss.v022.i08},
    keywords = {ecological modeling, qualitative validation criteria,
      time shift, R.},
  }