@article{NUMA_1992__63_1_133692,
     author = {Junping Wang and P.S. Vassilevski},
     title = {Multilevel iterative methods for mixed finite element discretizations of elliptic problems.},
     journal = {Numerische Mathematik},
     pages = {503--520},
     publisher = {mathdoc},
     volume = {63},
     number = {1},
     year = {1992},
     zbl = {0797.65086},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__63_1_133692/}
}