@article{DMDICO_2007_27_1_a0,
     author = {Alt, Walter and Br\"autigam, Nils and R\"osch, Arnd},
     title = {Error estimates for finite element approximations of elliptic control problems},
     journal = {Discussiones Mathematicae. Differential Inclusions, Control and Optimization},
     pages = {7--22},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {2007},
     zbl = {1191.49035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMDICO_2007_27_1_a0/}
}