@ARTICLE {FSV96,
   ANNOTE = {MR97h:65040},
   AUTHOR = {Fokkema, Diederik R. and Sleijpen, Gerard L. G. and Van der
             Vorst, Henk A.},
    TITLE = {Generalized conjugate gradient squared},
  JOURNAL = {J. Comput. Appl. Math.},
 FJOURNAL = {Journal of Computational and Applied Mathematics},
   VOLUME = {71},
     YEAR = {1996},
   NUMBER = {1},
    PAGES = {125--146},
     ISSN = {0377-0427},
    CODEN = {JCAMDI},}