@article{NUMA_1987__51_133194,
     author = {F. Brezzi and J., Jr. Douglas and R. Dur\'an},
     title = {Mixed {Finite} {Elements} for {Second} {Order} {Elliptic} {Problems} in {Three} {Variables.}},
     journal = {Numerische Mathematik},
     pages = {237--250},
     publisher = {mathdoc},
     volume = {51},
     year = {1987},
     zbl = {0631.65107},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__51_133194/}
}