@article{KNPS03a,
 author = {Keim, Daniel A. and North, Stephen C. and Panse, Christian and Schneidewind, Jörn},
 journal = {Palgrave Macmillan -- Information Visualization},
 month = {Mar},
 number = {1},
 pages = {58--67},
 title = {Visualizing Geographic Information: VisualPoints vs CartoDraw},
 volume = {2},
 year = {2003}
}