@article{ETNA_1993__1__a5,
     author = {Sleijpen, Gerard L.G. and Fokkema, Diederik R.},
     title = {BiCGstab($l$) for linear equations involving unsymmetric matrices with complex spectrum},
     journal = {Electronic transactions on numerical analysis},
     pages = {11--32},
     publisher = {mathdoc},
     volume = {1},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1993__1__a5/}
}