@Article{tvcg03-weiskopf,
  author = {Weiskopf, D. and Engel, K. and Ertl, T.},
  title  = {{Interactive Clipping Techniques for Texture-Based Volume Visualization and Volume Shading}},
  year   = {2003},
  pages  = {298--312},
  journal = {IEEE Transactions on Visualization and Computer Graphics},
  volume = 9,
  number = 3
}