@article{KPN05,
 author = {Keim, Daniel A. and Panse, Christian and North, Stephen C.},
 journal = {IEEE Computer Graphics and Applications},
 month = {May},
 number = {3},
 pages = {pp. 60-68},
 title = {Medial-Axis-Based Cartograms},
 volume = {25},
 year = {2005}
}