@article {FabLieTic08,
    AUTHOR = {Faber, Vance and Liesen, J{\"o}rg and Tich{\'y}, Petr},
     TITLE = {The {F}aber-{M}anteuffel theorem for linear operators},
   JOURNAL = {SIAM J. Numer. Anal.},
  FJOURNAL = {SIAM Journal on Numerical Analysis},
    VOLUME = {46},
      YEAR = {2008},
    NUMBER = {3},
     PAGES = {1323--1337},
}