To cite ads in publications use:

Pelissier R, Goreaud F (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. doi: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},
  }