On the minimal shift in the shifted laplacian preconditioner for multigrid to work

Cocquet, P. H., & Gander, M. J. (2016). On the minimal shift in the shifted laplacian preconditioner for multigrid to work. In Lecture Notes in Computational Science and Engineering (Vol. 104, pp. 137–145). Springer Verlag. https://doi.org/10.1007/978-3-319-18827-0_12