@ARTICLE {SVo96d,
   ANNOTE = {MR96k:65025},
   AUTHOR = {Sleijpen, G. L. G. and van der Vorst, H. A.},
    TITLE = {Reliable updated residuals in hybrid {B}i-{C}{G} methods},
  JOURNAL = {Computing},
 FJOURNAL = {Computing. Archives for Informatics and Numerical Computation},
   VOLUME = {56},
     YEAR = {1996},
   NUMBER = {2},
    PAGES = {141--163},
     ISSN = {0010-485X},
    CODEN = {CMPTA2},}