@article {216,
	title = {Local energy-optimizing subdivision algorithms},
	journal = {Computer Aided Geometric Design},
	volume = {25},
	year = {2008},
	pages = {137-147},
	author = {Ingo Ginkel and Georg Umlauf}
}
@conference {219,
	title = {Loop subdivision with curvature control},
	booktitle = {Eurographics Symposium on Geometry Processing},
	year = {2006},
	publisher = {Eurographics},
	organization = {Eurographics},
	author = {Ingo Ginkel and Georg Umlauf},
	editor = {K.~Polthier and A.~Sheffer}
}
