@article{Orchard91,

author={M. T. Orchard and C. A. Bouman},
title={Color quantization of images},
journal={IEEE Trans. on Signal Processing},
volume={39},
year={1991},
pages={2677-2690},
number={12},
comments = {color quantization incorporating hierarchical tree-structured
color palettes and performance criteria based on subjective
evaluations of image quality},
theme = {compression,quantification}
 }