@ARTICLE {SFo93,
   ANNOTE = {MR94g:65038},
   AUTHOR = {Sleijpen, Gerard L. G. and Fokkema, Diederik R.},
    TITLE = {Bi{C}{G}stab$(\ell)$ for linear equations involving unsymmetric
             matrices with complex spectrum},
  JOURNAL = {Electron. Trans. Numer. Anal.},
 FJOURNAL = {Electronic Transactions on Numerical Analysis},
   VOLUME = {1},
     YEAR = {1993},
   NUMBER = {Sept.},
    PAGES = {11--32 (electronic only)},
     ISSN = {1068-9613},}