Etereldes Gonçalves, Marcus Sarkis. Robust Parameter-Free Multilevel Methods for Neumann Boundary Control Problems. In Randolph E. Bank, Michael J. Holst, Olof B. Widlund, Jinchao Xu, editors, Domain Decomposition Methods in Science and Engineering XX. Volume 91 of Lecture Notes in Computational Science and Engineering, pages 111-118, Springer, 2013. [doi]
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