@InProceedings{jue:13f,
  author =  {T. Takacs and B. J\"uttler},
  title =   {Derivatives of Isogeometric Test Functions},
  booktitle = {Proc. Mathematics of Surfaces XIV},
  year =  {2013},
  publisher = {IMA},
  pages = {345-364},
  note = 	 {on CD}}