@InProceedings{Sykora04-NPAR,
  author =    "Daniel S\'{y}kora and Jan Buri\'{a}nek and Ji\v{r}\'{\i} \v{Z}\'ara",
  title =     "Unsupervised Colorization of Black-and-White Cartoons",
  booktitle = "Proceedings of International Symposium on Non-photorealistic Animation and Rendering",
  pages =     "121--127",
  year =      "2004",
}