@article{jue:21c,
title=     {Efficient matrix assembly in isogeometric analysis with
             hierarchical {B}-splines},
author=    {Pan, Maodong and J\"uttler, Bert and Mantzaflaris, Angelos},
journal=   {Journal of Computational and Applied Mathematics},
volume=    {390},
pages=     {113278},
year=      {2021},
doi=       {10.1016/j.cam.2020.113278},
}