To cite ENiRG (Ecological Niche in R-GRASS) in publications use:

Canovas, F., Magliozzi, C., Palazon-Ferrando, J.A., Mestre, F. and Gonzalez-Wanguemert, M. (2016). ENiRG: R-GRASS interface to efficiently characterize the ecological niche of species and predict habitat suitability. Ecography, 39: 593-59<doi:10.1111/ecog.01426>.

Corresponding BibTeX entry:

  @Article{,
    title = {ENiRG: R-GRASS interface to efficiently characterize the
      ecological niche of species and predict habitat suitability},
    author = {F. Canovas and C. Magliozzi and J.A. Palazon-Ferrando and
      F. Mestre and M. Gonzalez-Wanguemert},
    journal = {Ecography},
    year = {2016},
    volume = {39},
    pages = {593-598},
    doi = {10.1111/ecog.01426},
  }