@article{FrankTimpf2019,
  author    = {Andrew U. Frank and Sabine Timpf},
  title     = {Multiple representations for cartographic objects in a multi-scale tree — an intelligent graphical zoom},
  journal   = {Computers \& Graphics},
  volume    = {18},
  number    = {6},
  pages     = {823 -- 829},
  doi       = {10.1016/0097-8493(94)90008-6},
  year      = {2019},
}