@inproceedings{bridges2015:379, author = {Brander, David and Markvorsen, Steen}, title = {Surfaces with Natural Ridges}, pages = {379--382}, booktitle = {Proceedings of Bridges 2015: Mathematics, Music, Art, Architecture, Culture}, year = {2015}, editor = {Delp, Kelly and Kaplan, Craig S. and McKenna, Douglas and Sarhangi, Reza}, isbn = {978-1-938664-15-1}, issn = {1099-6702}, publisher = {Tessellations Publishing}, address = {Phoenix, Arizona}, url = {http://archive.bridgesmathart.org/2015/bridges2015-379.html} }