@article {Evans2006IEEET,
	title = {{A multiscale curvature filter for identifying ground returns from discrete return lidar in forested environments}},
	journal = {IEEE Transactions on Geoscience and Remote Sensing},
	volume = {45},
	number = {4},
	year = {2007},
	pages = {1029-1038},
	author = {Evans, J.~S. and Hudak, A.~T.}
}