Niall Bootland, Victorita Dolean. On the Dirichlet-to-Neumann Coarse Space for Solving the Helmholtz Problem Using Domain Decomposition. In Fred J. Vermolen, Cornelis Vuik, editors, Numerical Mathematics and Advanced Applications ENUMATH 2019 - European Conference, Egmond aan Zee, The Netherlands, September 30 - October 4. Volume 139 of Lecture Notes in Computational Science and Engineering, pages 175-184, Springer, 2019. [doi]