@article{Kei00,
 author = {Keim, Daniel A.},
 journal = {IEEE Transactions on Visualization and Computer Graphics (TVCG)},
 month = {Jan},
 number = {1},
 pages = {59--78},
 title = {Designing Pixel-oriented Visualization Techniques: Theory and Applications},
 volume = {6},
 year = {2000}
}