@article{NUMA_1985__47_133032,
     author = {F. Brezzi and J., Jr. Douglas and L.D. Marini},
     title = {Two {Families} of {Mixed} {Finite} {Elements} for {Second} {Order} {Elliptic} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {217--236},
     publisher = {mathdoc},
     volume = {47},
     year = {1985},
     zbl = {0599.65072},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1985__47_133032/}
}