@article{KHDH02,
 author = {Keim, Daniel A. and Hao, Ming C. and Dayal, Umeshwar and Hsu, Meichun},
 journal = {Visualization, San Diego 2001, extended version in: Information Visualization Journal, Palgrave},
 number = {2},
 title = {Pixel Bar Charts: A Visualization Technique for Very Large Multi-Attribute Data Sets},
 volume = {1},
 year = {2002}
}