@article{ETNA_1997__6__a10,
     author = {Hiptmair, R.},
     title = {Multigrid method for $H{(div)}$ in three dimensions},
     journal = {Electronic transactions on numerical analysis},
     pages = {133--152},
     publisher = {mathdoc},
     volume = {6},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1997__6__a10/}
}