@article {191,
	title = {Normals of subdivision surfaces and their control polyhedra},
	journal = {Computer Aided Geometric Design},
	volume = {24},
	year = {2007},
	pages = {112-116},
	author = {Ingo Ginkel and J{\"o}rg Peters and Georg Umlauf}
}
@conference {215,
	title = {On normals and control nets},
	booktitle = {Mathematics of Surfaces XI},
	year = {2005},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	author = {Ingo Ginkel and J{\"o}rg Peters and Georg Umlauf},
	editor = {R.~Martin and H.~Bez and M.~Sabin pages = 233-239}
}
@article {197,
	title = {Computing curvature bounds for bounded curvature subdivision},
	journal = {Computer Aided Geometric Design},
	volume = {18},
	year = {2001},
	pages = {455-462},
	author = {J{\"o}rg Peters and Georg Umlauf}
}
@conference {221,
	title = {Gaussian and mean curvature of subdivision surfaces},
	booktitle = {The Mathematics of Surfaces IX},
	year = {2000},
	author = {J{\"o}rg Peters and Georg Umlauf},
	editor = {R.~Cipolla and R.~Martin}
}
