@article{2004-J-TOG-VolumetricIllustration,
author={Shigeru Owada and Frank Nielsen and Makoto Okabe and Takeo Igarashi},
title={Volumetric illustration: {D}esigning {3D} models with internal textures},
journal={ACM Transactions on  Graphics (SIGGRAPH)},
volume={23},
number={3},
pages={322-328},
doi={10.1145/1015706.1015723},
year={2004}
}