@TECHREPORT {SES00,
     AUTHOR = {Sleijpen, Gerard L. G. and 
               {van den Eshof}, Jasper and 
               Smit, Paul},
      TITLE = {Optimal a priori error bounds for the {R}ayleigh-{R}itz method},
       TYPE = {Preprint},
     NUMBER = {1160},
INSTITUTION = {Dep. Math., University Utrecht},
       NOTE = {To appear in Math. Comp.},
    ADDRESS = {Utrecht, the Netherlands},
      MONTH = {September},
       YEAR = {2000},}


@ARTICLE {SES03,
     AUTHOR = {Sleijpen, Gerard L. G. and 
               {van den Eshof}, Jasper and 
               Smit, Paul},
      TITLE = {Optimal a priori error bounds for the {R}ayleigh-{R}itz method},
    JOURNAL = {Math. Comp.},
   FJOURNAL = {Mathematics of Computation},
     VOLUME = {72},
       YEAR = {2003},
     NUMBER = {242},
      PAGES = {677--684},
       NOTE = {Article electronically published on May 1, 2002},}