@article{HanteMommerPotschka, author = {Hante, Falk and Mommer, Mario and Potschka, Andreas}, title = {Newton-Picard preconditioners for time-periodic, parabolic optimal control problems}, series = {SIAM Journal on Numerical Analysis}, volume = {53}, journal = {SIAM Journal on Numerical Analysis}, number = {5}, doi = {10.1137/140967969}, pages = {2206 -- 2225}, language = {en} }