@article {36122,
	title = {Statistical classification of macroscopic folds as cylindrical, circular conical, or elliptical conical},
	volume = {20},
	year = {1988},
	pages = {717-730},
	publisher = {Mathematical Geology},
	url = {http://www.springerlink.com/content/6280464645541g25/fulltext.pdf},
	author = {Kelker, Douglas and Langenberg, Willem}
}
