@InProceedings{bsdw-itdsl-04,
author = { Kevin Buchin and J{\"u}rgen D{\"o}llner and Faramarz Samavati and Mario Costa Sousa and Maike Walther },
title = { Illustrating terrains using direction of slope and lighting },
booktitle = { Proc. 4th ICA Mountain Cartography Workshop },
year = { 2004 },
pages = { 259--269 },
organization = { Institut Cartogr{\`a}phic de Catalunya },
note = { Technical Report No.~8 },
}
