@ARTICLE{OlRu10,
  author = {Balzani, Nadine and Rumpf, Martin},
  title = {A Nested Variational Time Discretization for Parametric {W}illmore
	Flow},
  journal = {Interfaces Free Bound.},
  year = {2012},
  volume = {14},
  pages = {431--454},
  number = {4},
  doi = {10.4171/IFB/287},
  pdf = {http://numod.ins.uni-bonn.de/research/papers/public/OlRu10.pdf},
  fjournal = {Interfaces and Free Boundaries. Mathematical Modelling, Analysis and
	Computation},
}