@article {MR2277042,
    AUTHOR = {Sarkis, Marcus and Szyld, Daniel B.},
     TITLE = {Optimal left and right additive {S}chwarz preconditioning for
              minimal residual methods with {E}uclidean and energy norms},
   JOURNAL = {Comput. Methods Appl. Mech. Engrg.},
  FJOURNAL = {Computer Methods in Applied Mechanics and Engineering},
    VOLUME = {196},
      YEAR = {2007},
    NUMBER = {8},
     PAGES = {1612--1621},
      ISSN = {0045-7825},
     CODEN = {CMMECC},
   MRCLASS = {65N55},
  MRNUMBER = {2277042 (2007j:65114)},
       DOI = {10.1016/j.cma.2006.03.027},
       URL = {http://dx.doi.org/10.1016/j.cma.2006.03.027},
}