To cite 'sharx' in publications use with package version number:

Solymos, P and Lele, S R (2012). Global pattern and local variation in species-area relationships. Global Ecology and Biogeography 21, 109-120.

Corresponding BibTeX entry:

  @Article{,
    title = {Global pattern and local variation in species-area
      relationships},
    author = {P\'{e}ter S\'{o}lymos and Subhash R Lele},
    journal = {Global Ecology and Biogeography},
    year = {2012},
    volume = {21},
    pages = {109--120},
  }