Natural Hierarchical Refinement for Finite Element Methods Petr Krysl, Eitan Grinspun, and Peter Schröder, International Journal for Numerical Methods in Engineering, pp.1109–1124, 2003.
@Article{CG_0012,
author = {Petr Krysl and Eitan Grinspun and Peter Schröder},
title = {{N}atural {H}ierarchical {R}efinement for {F}inite {E}lement {M}ethods},
journal = {International Journal for Numerical Methods in Engineering},
volume = {56},
number = {8},
pages = {1109–1124},
year = {2003}
}