@article{COCV_2009__15_3_626_0,
     author = {Hinterm\"uller, Michael and Kopacka, Ian and Volkwein, Stefan},
     title = {Mesh-independence and preconditioning for solving parabolic control problems with mixed control-state constraints},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {626--652},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {3},
     year = {2009},
     doi = {10.1051/cocv:2008042},
     mrnumber = {2542576},
     zbl = {1167.49027},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2008042/}
}