@article{SchiffersSchurrTielboergeretal.2008,
  author    = {Katja Schiffers and Frank Martin Schurr and Katja Tielb{\"o}rger and Carsten Urbach and Kirk A. Moloney and Florian Jeltsch},
  title     = {Dealing with virtual aggregation : a new index for analysing heterogeneous point patterns},
  doi       = {10.1111/j.0906-7590.2008.05374.x},
  url       = {http://www3.interscience.wiley.com/journal/117966123/home},
  year      = {2008},
}