To cite NonpModelCheck in publications use:

Adriano Zanin Zambom, Michael G. Akritas (2017). NonpModelCheck: An R Package for Nonparametric Lack-of-Fit Testing and Variable Selection. Journal of Statistical Software, 77(10), 1-28.<doi:10.18637/jss.v077.i10>

Corresponding BibTeX entry:

  @Article{,
    title = {{NonpModelCheck}: An {R} Package for Nonparametric
      Lack-of-Fit Testing and Variable Selection},
    author = {Adriano Zanin Zambom and Michael G. Akritas},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {77},
    number = {10},
    pages = {1--28},
    doi = {10.18637/jss.v077.i10},
  }