Antony N. Spyropoulos Christos D. Antonopoulos Numerical study of mixed precision GMRES(m) preconditioned by deflation. 2026 April 2631-2657 101 Numer. Algorithms 4 https://doi.org/10.1007/s11075-025-02102-z db/journals/na/na101.html#SpyropoulosA26 streams/journals/na