@Article{Roehlig17_VisibilityWidgets_JVLC,
  author  = {Martin R{\"o}hlig and Martin Luboschik and Heidrun Schumann},
  title   = {Visibility Widgets for Unveiling Occluded Data in 3D Terrain Visualization},
  journal = {Journal of Visual Languages \& Computing},
  year    = {2017},
  volume  = {42},
  number  = {Supplement C},
  pages   = {86 - 98},
  issn    = {1045-926X},
  doi     = {10.1016/j.jvlc.2017.08.008},
}