@article{ETNA_1997__6__a12,
     author = {Diskin,  Boris},
     title = {Multigrid algorithm with conditional coarsening for the non-aligned sonic flow},
     journal = {Electronic transactions on numerical analysis},
     pages = {106--119},
     year = {1997},
     volume = {6},
     zbl = {0897.76060},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1997__6__a12/}
}