@Article{piringer2009vakdsi,
  author = 	 {Harald Piringer and Matthias Buchetis and Helwig Hauser and Eduard Gr\"oller},
  title = 	 {Hierarchical Difference Scatterplots: Interactive Visual Analysis of Data Cubes},
  journal = 	 {SIGKDD Explorations},
  year = 	 2009,
  volume = 	 11,
  number = 	 2,
  pages = 	 {49--58},
  month = 	 {December},
}