%0 Journal Article %A Diskin, Boris %T Multigrid algorithm with conditional coarsening for the non-aligned sonic flow %J Electronic transactions on numerical analysis %D 1997 %P 106-119 %V 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_1997__6__a12/ %G en %F ETNA_1997__6__a12