To cite ads in publications use:

Raphael Pelissier, Francois Goreaud (2015). ads Package for R: A Fast Unbiased Implementation of the K-function Family for Studying Spatial Point Patterns in Irregular-Shaped Sampling Windows. Journal of Statistical Software, 63(6), 1-18. URL http://dx.doi.org/10.18637/jss.v063.i06.

Corresponding BibTeX entry:

  @Article{,
    title = {{ads} Package for {R}: A Fast Unbiased Implementation of
      the $K$-function Family for Studying Spatial Point Patterns in
      Irregular-Shaped Sampling Windows},
    author = {Raphael Pelissier and Francois Goreaud},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {63},
    number = {6},
    pages = {1--18},
    doi = {10.18637/jss.v063.i06},
  }