@Article{FGCS99,
  author = 	 {Ertl, T. AND Westermann, R. AND Grosso, R.},
  title = 	 {Multiresolution and hierarchical methods for the visualization of volume data},
  journal = 	 {Future Generation Computer Systems},
  year = 	 {1999},
  volume = 	 {15},
  number = 	 {1},
  pages = 	 {31--42},
}