@article{NUMA_1987__55_4_133375,
     author = {Mary E. Morley},
     title = {A {Family} of {Mixed} {Finite} {Elements} for {Linear} {Elasticity.}},
     journal = {Numerische Mathematik},
     pages = {633--666},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {1987},
     zbl = {0671.73054},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__55_4_133375/}
}