L. Garcia Ramos

Accelerating the shifted Laplace preconditioner for the Helmholtz equation by multilevel deflation

Cornelis Vuik, Domenico Lahaye, Reinhard Nabben, 2016, J. Comput. Phys..

On the Spectrum of Deflated Matrices with Applications to the Deflated Shifted Laplace Preconditioner for the Helmholtz Equation

Reinhard Nabben, L. Garcia Ramos, 2018, SIAM J. Matrix Anal. Appl..