@article{M2AN_2008__42_1_1_0,
     author = {Kunisch, Karl and Volkwein, Stefan},
     title = {Proper orthogonal decomposition for optimality systems},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {1--23},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {1},
     year = {2008},
     doi = {10.1051/m2an:2007054},
     mrnumber = {2387420},
     zbl = {1141.65050},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/m2an:2007054/}
}