To cite gramEvol in publications use:

Farzad Noorian, Anthony M. de Silva, Philip H. W. Leong (2016). gramEvol: Grammatical Evolution in R. Journal of Statistical Software, 71(1), 1-26.<doi:10.18637/jss.v071.i01>

Corresponding BibTeX entry:

  @Article{,
    title = {{gramEvol}: Grammatical Evolution in {R}},
    author = {Farzad Noorian and Anthony M. {de Silva} and Philip H. W.
      Leong},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {71},
    number = {1},
    pages = {1--26},
    doi = {10.18637/jss.v071.i01},
  }