@INCOLLECTION{Wardetzky08Cotan,
  author = 	{Max Wardetzky},
  title = 	{Convergence of the Cotangent Formula: {A}n Overview},
  booktitle = 	{Discrete Differential Geometry},
  publisher = 	{Birkh\"auser Basel},
  year = 	{2008},
  editor = 	{Alexander I. Bobenko and John M. Sullivan and Peter Schr\"oder and
		G\"unter Ziegler}
}