@article{ETNA_2001__12__a1,
     author = {Dubrulle, A.A.},
     title = {Retooling the method of block conjugate gradients},
     journal = {Electronic transactions on numerical analysis},
     pages = {216--233},
     publisher = {mathdoc},
     volume = {12},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2001__12__a1/}
}