@INPROCEEDINGS{vis99-engel, 
 author = {Engel, K. and Westermann, R. AND Ertl, T.},
 title = "{Isosurface Extraction Techniques for Web-based Volume Visualization}",
 booktitle = {Proc. Visualization '99},
 year = {1999},
 pages = {139--146},
 organization = {IEEE},
}