Daniel A. Keim, Ming C. Hao, Umeshwar Dayal. Hierarchical Pixel Bar Charts. IEEE Trans. Vis. Comput. Graph., 8(3):255-269, 2002. [doi]
@article{KeimHD02,
title = {Hierarchical Pixel Bar Charts},
author = {Daniel A. Keim and Ming C. Hao and Umeshwar Dayal},
year = {2002},
url = {http://computer.org/tvcg/tg2002/v0255abs.htm},
tags = {C++},
researchr = {https://researchr.org/publication/KeimHD02},
cites = {0},
citedby = {0},
journal = {IEEE Trans. Vis. Comput. Graph.},
volume = {8},
number = {3},
pages = {255-269},
}