To cite the R package 'PGRdup' in publications use:

Aravind, J., J. Radhamani, Kalyani Srinivasan, B. Ananda Subhash, and R. K. Tyagi (2016). PGRdup: Discover Probable Duplicates in Plant Genetic Resources Collections. R package version 0.2.2.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {PGRdup: Discover Probable Duplicates in Plant Genetic
      Resources Collections},
    author = {{Aravind J} and {Radhamani J} and {Kalyani Srinivasan}
      and {Ananda Subhash B} and Rishi Kumar Tyagi},
    year = {2016},
    note = {R package version 0.2.2.1},
  }