Andreas Günther, Michael Hinze. Elliptic control problems with gradient constraints - variational discrete versus piecewise constant controls. Comp. Opt. and Appl., 49(3):549-566, 2011. [doi]
@article{GuntherH11,
title = {Elliptic control problems with gradient constraints - variational discrete versus piecewise constant controls},
author = {Andreas Günther and Michael Hinze},
year = {2011},
doi = {10.1007/s10589-009-9308-8},
url = {http://dx.doi.org/10.1007/s10589-009-9308-8},
researchr = {https://researchr.org/publication/GuntherH11},
cites = {0},
citedby = {0},
journal = {Comp. Opt. and Appl.},
volume = {49},
number = {3},
pages = {549-566},
}