To cite npde in publications use:

Comets E, Brendel K, Mentre F (2008). “Computing normalised prediction distribution errors to evaluate nonlinear mixed-effect models: the npde add-on package for R.” Computer Methods and Programs in Biomedicine, 90, 154–66.

To cite npde in publications use:

Comets E, Brendel K, Laffont C, Laveille C, Mentre F (2006). “Metrics for external model evaluation with an application to the population pharmacokinetics of gliclazide.” Pharmaceutical Research, 23, 2036–49.

Corresponding BibTeX entries:

  @Article{,
    title = {Computing normalised prediction distribution errors to
      evaluate nonlinear mixed-effect models: the npde add-on package
      for R},
    author = {Emmanuelle Comets and Karl Brendel and France Mentre},
    journal = {Computer Methods and Programs in Biomedicine},
    year = {2008},
    volume = {90},
    pages = {154--66},
  }

  @Article{,
    title = {Metrics for external model evaluation with an application
      to the population pharmacokinetics of gliclazide},
    author = {Emmanuelle Comets and Karl Brendel and Celine Laffont and
      Christian Laveille and France Mentre},
    journal = {Pharmaceutical Research},
    year = {2006},
    volume = {23},
    pages = {2036--49},
  }