@Article{jue:14n,
author = {T. Takacs and B. J\"uttler and O. Scherzer},
title = {Derivatives of Isogeometric Functions on
$n$-dimensional Rational Patches in $\mathrm{I}\!\mathrm{R}^d$},
journal = {Computer Aided Geometric Design},
year = {2014},
volume = {31},
pages = {567-581},
doi = {10.1016/j.cagd.2014.06.005}
}