@article{KYB_2010_46_2_a8,
     author = {Rees, Tyrone and Stoll, Martin and Wathen, Andy},
     title = {All-at-once preconditioning in {PDE-constrained} optimization},
     journal = {Kybernetika},
     pages = {341--360},
     year = {2010},
     volume = {46},
     number = {2},
     mrnumber = {2663605},
     zbl = {1195.65083},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2010_46_2_a8/}
}