@Article{jue:14l,
  author = 	 {U. Zore and B. J\"uttler},
  title = 	 {Adaptively Refined Multilevel Spline Spaces from Generating 
                  Systems},
  journal = 	 {Computer Aided Geometric Design},
  year = 	 {2014},
  volume = 	 {31},
  pages = 	 {545-566},
  doi =          {10.1016/j.cagd.2014.04.003}
}