R. A. Nicolaides, Deflation of Conjugate Gradients with Applications to Boundary Value Problems, SIAM Journal on Numerical Analysis, vol.24, issue.2, 1987.
DOI : 10.1137/0724027

J. M. Tang, R. Nabben, C. Vuik, and Y. A. Erlangga, Comparison of Two-Level Preconditioners Derived from??Deflation, Domain Decomposition and Multigrid Methods, Journal of Scientific Computing, vol.34, issue.3, 2009.
DOI : 10.1007/s10915-009-9272-6