@article{jue:16c,
author =      {N. Villamizar and A. Mantzaflaris and B. J\"uttler},
title =       {Characterization of bivariate hierarchical quartic box splines on a three-directional grid},
journal =     {Computer Aided Geometric Design}, 
year=         {2016},
volume =      {41},
pages =       {47-61},
doi =         {10.1016/j.cagd.2015.11.004},
}