@article{GlanderDoellner2009,
  author    = {Tassilo Glander and J{\"u}rgen Roland Friedrich D{\"o}llner},
  title     = {Abstract representations for interactive visualization of virtual 3D city models},
  doi       = {10.1016/j.compenvurbsys.2009.07.003},
  url       = {http://www.sciencedirect.com/science/journal/01989715},
  year      = {2009},
}